BIO120: vocab for final Flashcards
Skeletal muscle tissue
Striated or not
Voluntary or not
Location
Striated
Voluntary
Attached to bones
Cardiac muscle tissue
-Striated or not
Voluntary or not
-Location
- Striated
- Involuntary
- Heart
Smooth muscle tissue
- Striated or not
- Voluntary or not
- Location
-Nonstriated
-Involuntary
GI tract (digestion)
Functions of muscular tissue
Producing body movements
Stabilizing body positions
Moving substances within the body
Generating heat
Properties that enable muscle to function and contribute to homeostasis
Excitability
Contractility
Extensibility
Elasticity
Layers of muscle tissue
Epimysium
Perimysium
Endomysium
Epimysium
Outer layer of muscle tissue
Perimysium
Surrounds groups of muscle fibers separating them into groups called fascicles
Fascicles
Muscle fiber groups surrounded by the Perimysium
Endomysium
Inner layer of each fascicle and separates individual muscle fibers from one another
Tendon
attaches muscle to bone
Aponeurosis
Broad, flattened tendon
Muscle growth occurs by _________
Hypertrophy
What hormones cause muscle growth
Testosterone, human growth hormone
Sacromeres
Basic functional unit of a microfifbril
Contractile proteins
Myosin
Actin
Myosin
-What it looks like
Projections of each Myosin molecule protrude outward (myosin head) looks like a golf club
Actin
-Function
Provide a site where the Myosin head can attach
Structural proteins
Titin
Dystrophin
Titin (function)
Helps with stabilizing, extensibility, alignment
Dystrophin (function)
Very elastic. Helps muscle retain its shape
What is the main neurotransmitter and why is it so important
ACh
Muscle cannot move without it
The bacterium Clostridium botulinum (botulism) produces________
Botulinum toxin
What does Botulinum toxin do
What medicine is it used for
Blocks release of ACh from synaptic vesicles (therefore muscles cannot move)
Botox
Botox is used to treat:
Strabismus,
Blepharospasm,
Spasms of the vocal cords that interfere with speech,
alleviate chronic back pain due to muscle spasms in the lumbar region,
treating frown lines, wrinkles on the face and neck such as crows feet, forehead lines
Strabismus
How is it treated
Cross eyed
Botox
Blepharospasm
How is it treated
Uncontrollable blinking
Botox
Myasthenia gravis
what is it (symptoms)
An autoimmune disease leading to muscle weakness and fatigue
Muscles that control eye and eyelid movement, facial expressions, chewing, talking, and swallowing are especially suseptible
Function of anticholinesterase agents
What disease does it treat
Slow actions of acetycholinesterase which breaks down ACh (therefore ACh will stay in the synaptic cleft for longer)
Treatment for myasthenia gravis
Curare
Causes muscle paralysis by blocking ACh receptors
Creatine phosphate
Excess ATP is used to synthesize creatine phosphate
Energy rich molecule
Types of contractions
Isotonic
Isometric
Isotonic contraction
- what is it
- example
- The tension developed remains constant while the muscle changed in length
- lifting weights
Isometric contraction
- what is it
- example
- The tension generated is not enough for the object to be moved and the muscle does not change its length
- pushing a wall
Where is smooth muscle tissue found
- Walls of airways to the lungs
- Muscles that attach to hair follicles
- Muscles that adjust focus of the lens in the eye
- Gastrointestinal tract
Types of muscular tissue
Skeletal
Cardiac
Smooth
Another name for sensory neurons
Afferent
Function of sensory neurons
Deliver information from sensory receptors to the CNS
Another name for motor neurons
efferent
Function of motor neurons
Travel from the CNS to the peripheral effectors (muscles and glands) and produce an effect
Interneurons
- another name
- what nervous system (CNS or PNS)
- where exactly found
Association neurons
CNS
Between sensory and motor neurons
Two types of nervous tissue
Neurons (nerve cells)
Neuroglia
Nerve cells (neurons)
basic functional units of the nervous system
True or false, neurons possess electrical excitibilty
True
What is electrical excitibility
Responding to a stimulus and converting it into an action potential
Another word for a nerve impulse
Action potential
Parts of the cell body
Nucleus Cytoskeleton Mitochrondria Ribosomes Rough Endoplasmic Reticulum RER Nissel bodies
Cytoskeleton
- Location
- Function
Inside cytoplasm
Helps give shape
Mitochondria
-function
Produce ATP (energy)
Ribosomes
-function
Protein synthesis
Rough endoplasmic reticulum (RER)
-what do they contain
Ribosomes
Nissel bodies
- stain light or dark
- what do they contain
Dark
Clusters of RER and free ribosomes
Most neurons lack _______, therefore, CNS neurons cannot divide and cannot be replaced
Centrioles
Dendrites
- Look
- function
Highly branched
Receive information from other neurons
Axons
- Look
- Function
- Thickened region where the axon attaches to the cell body
Long processes
Sends signals away from the neuron
Axon Hillock
The axon ends at ________
Synaptic terminals
Synaptic cleft
A narrow space that separates the presynaptic cell from the postsynaptic cell
Synapse
Where cells come together
Bipolar neurons
- what they look like, or are made of
- commonality
- location
One dendrite, one axon
Rare
Found in special sense organs (eye)
Unipolar neurons
-look
Dendrites and axons are continuous
The cell body lies off to the side
Multipolar neurons
- commonality
- nervous system
Most common
CNS
True or false, Neuroglia generate action potentials
False
Another word for neuroglia
Glia
Two places where Neuroglia can be found
CNS and PNS
Cells of Neuroglia in the CNS
Astrocytes
Oligodendrocytes
Microglia
Ependymal
Astrocytes
- found in Neuroglia of what system
- shape, size
- commonality
- Create a ________ for the CNS
- Controls ___________
- CNS
- Star shaped, largest
- Most numerous
- Creates a 3 dimensional framework for the CNS
- Controls the interstitial environment (between the cells)
What type of cell is associated with the blood brain barrier and in what nervous system
Astrocytes (Neuroglia of the CNS)
Function of the blood brain barrier and what can pass through it
- Keeps harmful things out of the brain
- Oxygen, glucose, CO2, water
Oligondendrocytes
- nervous system
- forms the __________
- How many axons can it myelinate
- Neurglia of the CNS
- forms the myelin sheath around the CNS axons
- May myelinate several axons
What is the purpose of the myelin sheath
Makes action potentials go faster
Microglia
- Nervous system
- size
- function
- Neuoglia of the CNS
- small cells
- Phagocytosis
Ependymal cells
- Nervous system
- location
- Neuoglia of the CNS
- line the central canal and the ventricles
Neuroglia of the PNS
Schwann cells
Satellite cells
Schwann cells
- Nervous system
- function
- How many axons will it myelinate
- Neuroglia of the PNS
- encircle PNS axons, forms the myelin sheath
- a single Schwann cell will myelinate a single axon
Schwann cell of the PNS has the same function as the_________ of the CNS
Oligodendrocytes
Satellite cells
- Nervous syetm
- function
- Neuroglia of the PNS
- structural support
What is myelin made of
Lipid and protein
Myelinated vs unmyelinated
Myelin sheath makes action potential go faster
Gaps in the myelin sheath
Nodes of Ranveir
Demyelination
- what it is
- symptoms
Destruction of the myelin sheath
-Loss of sensation, motor control, numbnuss, paralysis