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physiology. > Study guide 3 > Flashcards

Study guide 3 Flashcards

1
Q

What do synaptic vesicles do?

A

They release neurotransmitters at chemical synapses.

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2
Q

How can synaptic vesicles release neurotransmitters

A

Through a process called exocytosis which is triggered by calcium ions

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3
Q

What is a central synapse?

A

A connection between neurons in the central nervous system.

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4
Q

is a central synapse the same as the NMJ?

A

Central synapses and the NMJ are not the same. Both are synapses but a central synapse is in the brain while the NMJ is where a motor neuron meets a muscle fiber.

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5
Q

What is a bouton?

A

Boutons (buttons)= numerous presynaptic terminals.

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6
Q

What molecules can be neurotransmitters?

A

Small molecules
- Acetycholine
- Adenosine triphosphate (ATP)
- Nitric oxide (NO)
Amines
Amino Acids

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7
Q

What is an ionotropic receptor?

A

An ionotropic receptor is a ligand-gated, chemically gated, neurotransmitter-gated receptor.

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8
Q

What is a metabotropic receptor?

A

Membrane receptor that modulates cell activity by initiating metabolic steps.

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9
Q

EPSP and IPSP

A

Inhibitory postsynaptic potential (IPSP)
Excitatory postsynaptic potential (EPSP)

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10
Q

Excitatory cholinergic synapse

A
  • Use acetylcholine (Ach)
  • AP depolarizes the axon terminal and opens voltage-gated ca2+ channels. Ca2+ enters, triggers exocytosis of Ach
  • AP triggered in the postsynaptic cell
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11
Q

Inhibitory GABA-ergic synapse

A
  • Uses y-aminobutyric acid (GABA) as neurotransmitter
  • GABA receptors are chloride channels
  • Postsynaptic neuron inhibited, less likely to fire action potential
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12
Q
  • Are neurotransmitters inhibitory or excitatory? What determines if a neurotransmitter will
    lead to inhibition or excitation. Are they always one or the other?
A

Some neurotransmitters will lead to excitation in the postsynaptic cell, others will lead to inhibition.
It Depends on which ionic conductances are activated or inactivated by the neurotransmitter.
Depends entirely on which receptor proteins are activated or inactivated by the neurotransmitter at that particular synapse.

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13
Q

How do you end a signal sent from a presynaptic cell to a postsynaptic cell? What
happens to released neurotransmitters?

A

Presynaptic cell stops releasing neurotransmitter
The neurotransmitter already in the synapse is cleared

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14
Q

What are the modes of synaptic transmission?

A

Vesicular secretion
- Movement from the presynaptic to the postsynaptic cell
Retrograde
- Release of a lipid-soluble molecule from the postsynaptic cell.
Non-vesicular
- Release of water-soluble molecules through a transmembrane channel within the plasma membrane.

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15
Q

Vesicular secretion

A

vesicles release cargo, the release is ca2+ triggered exocytosis. This is the first to be discovered and is the “classic” mode of vesicular secretion.
The movement is “orthograde,” which means the movement from presynaptic to postsynaptic cell.

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16
Q

Retrograde

A

Release of a lipid-soluble molecule from the postsynaptic cell. Nitric Oxide (NO) released

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17
Q

Non vesicular

A

a vesicle is not needed. Release of a water-soluble molecule through a transmembrane channel within the plasma membrane. Thought to be CALHM1 in type II taste receptor cells within taste buds.

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18
Q

What did Santiago Ramon y Cajal do? and what is the black reaction

A

Santiago Ramon y Cajal discovered the synaptic cleft. Used a tissue staining method known as the Black Reaction.

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19
Q

who created the black reaction?

A

The black reaction was created by Camillo golgi

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20
Q

cells bodies in the cns vs pns

A

CNS: nucleus
PNS: Ganglion

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21
Q

What is the central nervous system composed of? How is the peripheral nervous system different?

A

CNS: brain & spinal cord
PNS: sensory & motor

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22
Q

neurons in the nervous system

A

1 trillion

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23
Q

neuroglia cells

A

cells that support neurons in the nervous system

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24
Q

How many neuroglia cells in the nervous sytem

A

10x more than neurons

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25
Q

Four types of neuroglia cells in the CNS

A

Oligodendrocytes, ependymal cells, microglia, and astrocytes.

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26
Q

Two types of neuroglia cells in the PNS

A

Schwann cells and satellite cells

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27
Q

Universal properties of neurons

A

Excitability (irritability)
Respond to environmental changes (stimuli)
Conductivity: Produce electrical signals that travel along nerve fibers (axons) to reach other cells at distant locations.
Secretion: Nerve fiber endings (axon terminals) release chemical neurotransmitters that influence other cells

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28
Q

dendrites

A

multiple branches that come off the soma, primary site for receiving signals from other neurons.

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29
Q

soma (cell body)

A

has a centrally located nucleus with large nucleolus. Contains mitochondria, lysosomes, Golgi complex, rough ER, inclusions, and cytoskeleton like other cells. No centrioles.

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30
Q

axon (nerve fiber)

A

specialized for rapid conduction of electrical signals, only one axon per neuron, Originates at the axon hillock.

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31
Q

axon terminals

A

swellings that form contact points (synapses) with other cells. Contain synaptic vesicles full of neurotransmitters.

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32
Q

myelin sheath

A

insulating layer surrounding some axons. Formed by glial cells.

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33
Q

Multipolar neurons

A

One axon and multiple dendrites (most neurons in the CNS)

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34
Q

Bipolar neuron

A

One axon and one dendrite (olfactory cells, retina, inner ear, taste buds)

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35
Q

Unipolar neuron

A

a single process leading away from soma (sensory cells from skin and organs to the spinal cord)

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36
Q

Where do you find bipolar neurons

A

You’d find bipolar neurons in olfactory cells, retina, inner ear, or taste buds.

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37
Q

Where do you find anaxonic neurons

A

many dendrites but no axon (retina, brain, adrenal gland.)

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38
Q

What is gray matter?

A

Gray matter contains cell bodies, dendrites, and synapses. Darker color due to very little myelin present in the tissue. Forms surface layer (cortex) over cerebrum and cerebellum. Forms nuclei deep within the brain.

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39
Q

White matter

A

White matter: Bundles of axons. White color from lots of myelin. Called “tracts” in the CNS and “nerves” in the PNS. Deep to cortical gray matter in the brain. Superficial to gray matter in the spinal cord.

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40
Q

What does the nervous system develop from in the embryo (which tissue layer)?

A

The nervous system develops from the ectoderm (outermost tissue layer of the embryo)

The word ectoderm comes from the Greek ektos meaning “outside”, and derma meaning “skin”. Ectoderm.

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41
Q

How does the neural tube form

A
  1. Dorsal midline of embryo thickens to form neural plate
  2. Neural plate sinks and its edges thicken.
  3. Forms neural groove with a raised neural fold on each side.
  4. Neural folds fuse, creating a hollow neural tube by day 26.
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42
Q

How much blood flow goes to the brain?

A

Estimated 15% of cardiac output

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43
Q

Why does the brain need so much blood

A

It requires a constant supply of blood to deliver oxygen and nutrients to its cells and to support its high metabolic demand.

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44
Q

The brain is protected by the skull, membranes, and fluid. What are these membranes?

A

From outermost to innermost
Dura mater
Arachnoid mater
Pia mater

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45
Q

What is the fluid? What is the benefit to having our brain surrounded by fluid?

A

Cerebrospinal fluid (CSF). It protects and nourishes the brain & spinal cord.

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46
Q

What is the choroid plexus?

A

The choroid plexuses are thin, highly vascularized, transporting epithelial structures that protrude into the ventricles.

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47
Q

What does the choroid plexus do

A

create cerebrospinal fluid.

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48
Q

What is the cerebrum?

A

The cerebrum is the largest, most conspicuous part of the human brain. It’s the seat of sensory perception, memory, thought, judgment, and voluntary motor actions.

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49
Q

Outer layer of the cerebrum is called? What color is it

A

The outer layer, the cerebral cortex, is made up of grey matter.

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50
Q

Frontal lobe

A
  • Voluntary motor control of skeletal muscles; personality; high intellectual processes; verbal communication.
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51
Q

Parietal lobe

A
  • Cutaneous and muscular sensations, understanding speech and formulating words to express thoughts and emotions, interpretation of textures and shapes.
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52
Q

Occipital lobe

A
  • Integration of movements in focusing the eye; correlation of visual images with previous visual experiences and other sensory stimuli.
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53
Q

Temporal lobe

A
  • Memory; sensory and visceral integration.
54
Q

What is the primary motor cortex?

A

The motor area that controls voluntary skeletal muscles is known as the primary motor cortex.

55
Q

What is the motor circuit?

A

The motor circuit is formed by interconnections between the motor cortex, the basal nuclei, and other brain regions.

56
Q

GABA in the motor circuit

A

GABA is usually used to calm down neurons and make them less excitable.

57
Q

What is lateralization?

A

Lateralization refers to the fact that the right and left cerebral hemispheres have different functions.

58
Q

Which hemisphere deals speech? What about spatial concepts?

A

Left: speech
Right: Spatial concepts

59
Q

What is the corpus callosum?

A

Corpus callosum: the myelinated axon tracts connecting the two hemispheres

60
Q

Why would anyone want a split brain?

A

They would have a corpus callosotomy has been used to reduce seizures in medically refractory epilepsy.

61
Q

What two important areas play a role in speech?

A

Wernicke’s area and Broca’s area.

62
Q

What is it called when you have speech
deficits?

A

A speech deficit is called aphasias.

63
Q

How is speech impacted when Broca’s area is damaged?

A

When Broca’s area is damaged words may be uttered very slowly and poorly articulated.

64
Q

How is speech impacted when wernickes area is damaged?

A

When Wernicke’s area is damaged the person has difficulty with understanding language and forming meaningful sentences.

65
Q

Where is the limbic system,

A

The limbic system is in the temporal lobe.

66
Q

What is part of the limbic system?

A

the amygdala and hippocampus.

67
Q

what does the limbic system do?

A

limbic system controls emotions.

68
Q

What does the hippocampus do?

A

Learning and memory

69
Q

What is the hypothalamus?

A

Controls, temperature, water, hunger, emotional, sexual response, memory, and sleep.

70
Q

What does the hippocampus resemble (what is it named after)?

A

seahorse

71
Q

What is the physical basis of memory?

A

Is a pathway through the brain called a memory trace or engram.

72
Q

What is synaptic plasticity?

A

Ability of synapses to change

73
Q

synaptic potentiation

A

Process of making transmission easier

74
Q

Some memories last—–

A

short time periods and are not retained but others can last long periods of tine due to molecular changes

75
Q

What are dendritic spines

A

Tiny buds on dendrites which are the location of many synapses

76
Q

pyramidal cells?

A

Large neurons of primary motor cortex

77
Q

Why is long-term memory considered activity dependent?

A

Because it requires protein and RNA synthesis & synaptic changes
(I have no idea)

78
Q

NMDA receptor

A

a receptor site on the hippocampus that influences the flow of information between the neurons by controlling the initiation of long-term potentiation.

79
Q

AMPA receptor

A

ionotropic glutamate receptor that controls a sodium channel; stimulated by AMPA.

80
Q

What role does mg2+ play

A

NMDA receptors at the same synapse remain blocked by extracellular mg2+ until postsynaptic membrane depolarization occurs.
yeah don’t know

81
Q

membrane depolarization occurs.
* How does calcium get into the post-synaptic cell? What does it do?

A

Ca2+ influx into the postsynaptic neuron activates ca2+-activated proteins, which triggers the insertion of additional AMPA receptors.
i have no clue

82
Q

How does a cell’s sensitivity to glutamate get changed with use? What does nitric oxide do?

A

When NMDA receptors bind glutamate and receive tetanic stimuli, they allow ca2+ to enter the cell.
Nitric oxide is a retrograde neurotransmitter.

83
Q

What organisms have circadian rhythms?

A

Circadian rhythms have been observed in: animals, plants, fungi, and cyanobacteria.

84
Q

Do all animals have the same day/night cycle
as humans?

A

Not all animals have the same day-night cycle.

85
Q

Why even have a day/night cycle?

A

Circadian rhythms enable our bodies to anticipate challenge to homeostasis. This is known as “anticipatory homeostasis”

86
Q

Circadian rhythms are considered endogenous (built-in) but they can be entrained. What
does that mean?

A

They can be synchronized by the cues in the environment.

87
Q

What is the most important environmental cue we use for sleep?

A

Light is the most important environmental cue in entraining our circadian rhythms. It is totally reliable.

88
Q

Why do we feel so bad when we have jet lag?

A

Our internal body clock is out of sync with the new time zone.

89
Q

What wavelengths of light are more energetic?

A

The shorter the wavelength the more energetic than light having longer wavelengths.

90
Q

What are iPRGs, where are they found, and what do they detect?

A

Intrinsically photosensitive retinal ganglion neurons (iPRGs) in the retina.

91
Q

What is melanopsin? Is it different from melatonin?

A

Melanopsin: a photo-sensitive G protein couples receptor (GPCR) that is similar to rhodopsin used for vision.
not the same as melatonin

92
Q

iPRGs project their axons where? Why does this information need to get there?

A

End in many CNS regions, one of which is the master circadian clock of the brain. These ganglion cells make sure the clock is set to a 24 hour schedule.

93
Q

Where is the suprachiasmatic nucleus (SCN)? Does it play a role in vision?

A

Located in the anterior part of the hypothalamus, specifically just above the optic chiasm, in the brain, essentially at the base of the anterior hypothalamus.

94
Q

Can you explain how information from the SCN gets to the pineal gland?

A

this is probably wrong:
Most SCN neurons produce action potentials at dawn & increase the
frequency of APs into midday (and then decrease APs into the night).
This circadian rhythm in neuronal action potential firing regulates the
pineal gland’s secretion of melatonin.
If the SCN are experimentally destroyed, circadian rhythmicity is lost

95
Q

What is the Retino-Hypothalamic Tract (RHT)? Is this the same thing as the optic tracts?

A

A neural pathway that carries light information directly from the retina to the suprachiasmatic nucleus in the hypothalamus. It is not the same thing as the optic tracts.

96
Q

nucleus in the hypothalamus. It is not the same thing as the optic tracts.
* Why is the SCN called the “Master Clock”?

A

Because it coordinates circadian rhythms.

97
Q
  • The superior cervical ganglia (SCG) provide sympathetic innervation to the pineal gland.
    Where is the SCG found?
A

Paired ganglia in the neck that contain the somata of post-ganglionic sympathetic neurons.

98
Q
  • Where is the pineal gland found? What does it look like (what is it named for)?
A

Located in the roof of the 3rd ventricle of the brain. Also known as the epiphysis. Like a pinecone.

99
Q

What happens to the pineal gland as we age? What does it produce?

A

After age 7 it shrinks. Down 75% by the end of puberty. Produces melatonin.

100
Q

Why is melatonin considered the “hormone of darkness”?

A

It is secreted when there is NO blue light hitting the retinas.

101
Q

Around what time of the night is melatonin at its peak level of secretion?

A

Around 3:00 am.

102
Q

Why can a large meal (like thanksgiving dinner) make us sleepy?

A

Melatonin is an indoleamine hormone synthesized from the amino acid L-tryptophan, which is liberated when dietary proteins are digested.

103
Q

We discussed S.A.D., and Night-shift work. What causes S.A.D.?

A

S.A.D is caused by secretion of melatonin during the day (this is caused by staying indoors).

104
Q

Why is night-shift
work so hard for people to do?

A

Night shift work is difficult because they need complete darkness during the day and exposure to sufficiently bright blue light during the night which is not achieved.

105
Q

Which animals are known to deprive
themselves of sleep?

A

Humans are the only animals who deliberately deprive themselves of sleep.

106
Q

What are some effects of sleep deprivation?

A

decreased life span and increased likelihood of developing Alzheimer’s.

107
Q

Is sleep a passive or active process? Why?

A

Sleep is an active process because it requires energy and important processes occur during sleep.

108
Q

What are the two main types of sleep?

A

REM sleep: rapid eye movement or dreaming sleep
Non-REM sleep: resting sleep, slow wave sleep, and deep sleep.

109
Q

How long is a sleep cycle?

A

Around 90 minutes.

110
Q

What are the stages that occur during the sleep cycle?

A

Awake: beta waves
Drowsy: alpha waves
1: theta waves
2: theta waves with spindles
3: delta waves
4: delta waves.
i dont know

111
Q

How many cycles do we normally have a night? Is this why we say we need 7-9 hours of sleep
each night?

A

We cycle between REM and non-REM about five times a night if we sleep enough. probably

112
Q

In the EEG, if you recorded an alpha rhythm what would you expect that person to be
doing? What about beta rhythm?

A

Alpha: drowsy or meditating.
Beta: Alert.

113
Q

What is seen in EEG recordings of people sleeping? Are they alpha or beta rhythms?

A

What is seen in EEG recordings of people sleeping? Are they alpha or beta rhythms?
EEG pattern changes profoundly in sleep. As a person becomes increasingly drowsy, their EEG wave pattern transitions from a beta rhythm to one that is predominantly alpha.

114
Q

What are the four stages of Non-REM sleep

A
  1. Transition from wake to sleep, very light sleep
  2. Light sleep
  3. Transition to deep sleep
  4. Deep sleep
115
Q

What is happening during REM sleep?

A

REM sleep is said to be “sort of like being awake”

116
Q

What is paradoxical sleep? Why is it called that?

A

REM sleep is also called paradoxical sleep because the EEG looks like the person might be awake but they are actually asleep.

117
Q

The amount of time spent in REM sleep decreases with age. Why is this?

A

Spontaneous arousals increase in older adults.
Older adults go to sleep/wake up earlier due to advances in a normal circadian sleep cycle.
More respiratory disorders that impact sleep occur as you age.

118
Q

Why even have
REM sleep?

A

We have REM sleep because it “allows us to practice dangerous activities without actually endangering ourselves” That sounds made up as hell

119
Q

What does our sleep look like throughout the night?

A

Alert, drowsy, stage 1, stage 2, stage 3, stage 4, stage 3, stage 2, stage 1, REM
i think

120
Q

What is the sleep progression?

A

Going through sleep

121
Q

How often do we get a chance to get into that very deep sleep?

A

Not very often probably

122
Q

Why is deep sleep needed?

A

Rest and repair of the body.

123
Q

Why do we need sleep? How long can you go without sleep?

A

11 days with no sleep
We need it because it facilitates the consolidation of short-term memories into long-term memories.

124
Q

Why can’t you make up sleep on the weekend?

A

It can help with improving how you feel, but you don’t get the time to repair your body every day like you need.

125
Q

Do teenagers actually need that much sleep?

A

Teenagers need a lot of sleep because circadian rhythms can change.

126
Q

What is sleep paralysis? Is it harmful?

A

During REM your skeletal muscles are paralyzed. Sometimes people wake up but they cant move for a few seconds or minutes. Scary but not dangerous.

127
Q

What is sleep apnea? Why does it cause disrupted sleep?

A

Periodic cessation of breathing during sleep. Because it activates the oxygen sensors in your cardiovascular and nervous systems, and they sound the alarm that you need to breathe.

128
Q

which apnea is due to the physical narrowing of the upper airway

A

Obstructive sleep apnea is a physical narrowing or collapse of the upper airways. Can be as a consequence of obesity, loss of muscle tone during aging, or decreased airway related muscle activity during REM sleep.

129
Q

treatment of sleep apnea

A

Surgical treatment for airway obstruction (e.g., remove some adipose tissue)
CPAP (Continuous Positive Airways Pressure) mask helps keep airways open during sleep.

130
Q
  • What is narcolepsy?
A

The person has an uncontrollable, undeniable need to fall asleep during daytime activities.

131
Q

The person has an uncontrollable, undeniable need to fall asleep during daytime activities.
What do we think might cause narcolepsy?

A

May be caused by an autoimmune attack or orexin/hypocretin-secreting neurons in the hypothalamus.

132
Q

What is sleep hygiene?

A

Healthy sleep habits and getting good sleep.

physiology. (8 decks)

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