Flashcards in Muscular System Deck (112)
2 prefixes that mean/refer to muscle
What are the three series-elastic components of muscular tissue?
Are the 3 series-elastic components of muscular tissue excitable?
NO but they do stretch and recoil
In what type of pairs do voluntary muscle usually work?
What happens to your muscles when you work out?
Do NOT make more fibers/muscle, you are making your fibers bigger
Do muscles expand?
NO they only contract
ex: muscle contracts to flex arm then an entirely diff. muscle contracts to bring arm back down
What is the name of the cell membrane in a muscle?
a group of muscle fibers
Difference btwn perimysium, endomysium, and epimysium
Epimysium- surrounds whole muscle
Endomysium- wraps each individuals muscle fiber
Perimysium- surrounds each muscle fiber bundle, called fascicles
What do myofibril contain in a muscle cell?
Thin and thick filaments
What is the one neurotransmitter in skeletal muscle?
The ONLY one neurotransmitter in skeletal muscle
In which direction does a neuron nerve cell travel?
In the direction in which the axon is pointing; it's a one way street they can't go back the same way they came from
Where are neurotransmitters
In synaptic vesicles
How does a neuron move?
Electrical impulse forces calcium channels to come in and push synoptic vesicles to the end of the axon
From left to right, what is the anatomical structure of a neuron
dendrites, soma (body), axon (synaptic vesicles in membrane), gap/synapsis/junction, NEIGHBORING neuron
How does an electrical impulse get from one neuron to another?
Dendrites on the next cell/neuron have receptors for the neurotransmitter acetylcholine, once they receive the acetylcholine the electrical impulse starts all over again on the new neuron
Why can't electrical impulses travel backwards?
There are no receptors on the front of the cell, only on the dendrites, and there is no acetylcholine in dendrites only receptors
the change in electrical potential associated with the passage of an impulse along the membrane of a muscle cell or nerve cell
What are the only two types of cells that have action potential?
nerve cells and muscle cells
What happens when the acetylcholine goes to muscle fiber?
Goes to the synapse called neuromuscular junction and the muscle contracts
where neuron and muscle meet
What happens to acetylcholine after it does its job?
Acetylcholinesterase (enzyme) breaks it down then the neuron (it came from originally) picks up the broken down neurotransmitter and rebuilds it to use it again.
Selective seratonin re-uptake inhibitor
ex: prozac, Zoloft, ect.
Going INTO the brain (Afferent)
Going FROM brain to muscle (Efferent)
How many mitochondria do muscles have?
What does the sarcolemma consist of?
it has characteristic transverse (T) tubules which are continuous with the sarcolemma. The fibers are multi nucleic