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Pathophysiology > Lecture 2 > Flashcards

Lecture 2 Flashcards

1
Q

Resting membrane potential

A

Difference in charge across a cell membrane inside and outside the cell at rest.

(Leakage channels are constantly diffusing ions creating homeostatic balance)

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2
Q

Aspects effecting membrane potential

A
  1. Fixed ions
  2. Cellular proteins
  3. Phosphate groups
  4. Other organic compounds

Intercellular space is K+ abundant and gives resting membrane potential.

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3
Q

Graded potentials

A

Small changes in membrane potential below the action potential threshold.

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4
Q

Types of graded potentials

A

Leakage - constantly open and passive

Ligand - gated- open via chemical stimulation (ex. Hormone or Neuro T binds)

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5
Q

Voltage gated Channels

A

Once voltage threshold is reached, voltage gated channels open.

Two main types:
Sodium
Potassium

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6
Q

Action Potential Stages

A
  1. Resting stage
  2. Depolarization
  3. Repolarization
  4. Hyperpolarization

Sodium floods into the cell depolarizing until the peak which then closes the sodium voltage gates. More slowly potassium floods out of the cell to repolarize until re-reaching the membrane potential at which point the potassium voltage gated channels close and remain at resting potential.

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7
Q

Physiological application of Action potentials

A
  1. Nerve traffic
  2. Muscle contraction
  3. Hormone release
  4. G.I. Secretions
  5. Cognition
  6. Senses
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8
Q
A
  1. Input zone - incoming signals come in
  2. Trigger zone- (hillock) Action Potentials are initiated
  3. Conducting zone- area that sends the actions potential information
  4. Output zone- (terminal) releases neuro T that influences other cells .
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9
Q

Factors that effect Action Potentials

A
  1. Strength of stimulus
  2. Distance synapse is traveling

*APs are essential for our senses

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10
Q

Golgi Type 1

A

Neurons with long axons that begin in the grey matter in the CNS, and extends to remote peripheral organs. (Projection neurons- can also be found in motor cells of the spinal cord)

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11
Q

Golgi Type II

A

Have shorter axons and are primarily in the CNS in the cerebral and cerebellar cortexes.

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12
Q

Electrical synapses

A

Bidirectional signals sent via gap junctions.

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13
Q

Neurochemical synapses

A

Begin as an electrical impulse, releases chemical substance ( neuro T) and then re-becomes an electoral impulse.

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14
Q

Neurotransmission stages

A
  1. Neuro T is synthesized and packaged
  2. Action potential arrives at presynaptic terminal
  3. As depolarization happens Ca2+ channels open
  4. Ca2+ influx tiggers transmitter vesicles to fuse with the presynaptic membrane
  5. Neuro T molecules diffuse across the synaptic cleft and bind to their accompanying receptors on the post synaptic cell.
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15
Q

Ionotropic receptors

A

Transmembrane group of ion channels that open or close in response to a ligand (chemical messenger like a Nero T - acetylcholine)

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16
Q

Metabotropic receptors

A

Membrane receptors that use signal transduction mechanisms (G proteins) activate intracellular events like second messenger chemicals.

(Post synaptic responses- which introduces more Ca2+ into the system).

ex. Glutamate receptors, GABA b receptors, serotonin receptors).

17
Q

EPSPs mechanism

A

Typically influx of Na+

18
Q

IPSP mechanism

A

Typically influx of Cl-

19
Q

Excitatory Amino Acid Neurotransmitters

A
  1. Glutamate
  2. Aspartate
20
Q

Inhibatory Amino Acid Neurotransmitters

A
  1. GABA
  2. Glycine

** serotonin can be both inhibatory and excitatory

21
Q

Amine Neurotransmitters

A
  1. Dopamine
  2. Acetylcholine
  3. Norepinephrine
  4. Epinephrine
  5. Histamine
22
Q

Peptide Neurotransmitters

A
  1. Substance P
  2. Enkephalin
  3. Dynorphin
23
Q

Actions after synaptic response is complete

A
  1. Enzymatic degradation
  2. Diffusion away from post synaptic receptors
  3. Reuptake into presynaptic nerve terminal
  4. Desensitization of postsynaptic receptor to ligand.
24
Q

Neuromuscular Junction Ionotropic Channel (neuro t and receptor)

A

Acetylcholine is the Neuro T —-
Nicotinic is the receptor

25
Q

Types of Neuron Proagation

A
  1. Contiguous - unmyelinated neuron
  2. Saltatory - myelinated with nodes of Ranvier
26
Q

Anatomy of a synapse

A
  1. Presynaptic neuron
  2. Synaptic knob
  3. Synaptic vesicles
  4. Postsynaptic neuron
  5. Synaptic cleft

** synapses send information to muscles, glands, or other neurons

27
Q

ATP production sources and amount of energy in time that is produced.

A
  1. Anaerobic respiration (30 secs)
  2. Direct phosphorylation from creatine phosphate (15 secs)
  3. Aerobic (long term energy).
28
Q

Spatial Summation Action

A

Results from a buildup of a neurotransmitter released simultaneously by several synaptic end bulbs.

29
Q

Temporal Summation Action

A

Results from buildup of neurotransmitter released by a single presynaptic end bulb two or more times on rapid succession.

30
Q

Neuro-hormone

A

A hormone that is produced by neurosecretory cells and released by nerve impulses.

Ex. Norepinephrine, oxytocin, vasopressin

31
Q

Four types of chemical messengers

A
  1. paracrines - local messengers
  2. Neuro T - short range
  3. Hormones- long range
  4. Neuro-hormones - long range
32
Q

Composition of Myelin Sheath and where they’re made

A

Concentric layers of protein alternating with lipid. Can be wrapped up to 100x

Oligodendrocytes - CNS
Schwann Cells - PNS

33
Q

Classification of nerve fibers

A
  1. Distribution
  2. Structure
  3. Origin
  4. Function
  5. Neuro T
    a) adrenergic
    b) cholenergic
34
Q

Autocrine vs. Paracrine

A

Autocrine - effects substance on the cell from it is secreted

Paracrine- relating to a hormone the has effect in the vicinity.

Pathophysiology (11 decks)

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