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Flashcards in Muscular System Deck (112)
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1

2 prefixes that mean/refer to muscle

myo
sarco

2

What are the three series-elastic components of muscular tissue?

The stretchy:
1. endomysium
2.perimysium
3. epimysium

3

Are the 3 series-elastic components of muscular tissue excitable?

NO but they do stretch and recoil
(dont contract)

4

In what type of pairs do voluntary muscle usually work?

Antagonistic

5

What happens to your muscles when you work out?

Do NOT make more fibers/muscle, you are making your fibers bigger

6

Do muscles expand?

NO they only contract
ex: muscle contracts to flex arm then an entirely diff. muscle contracts to bring arm back down

7

What is the name of the cell membrane in a muscle?

sarcolemma

8

Fascicle

a group of muscle fibers

9

Difference btwn perimysium, endomysium, and epimysium

Epimysium- surrounds whole muscle

Endomysium- wraps each individuals muscle fiber

Perimysium- surrounds each muscle fiber bundle, called fascicles

10

What do myofibril contain in a muscle cell?

Thin and thick filaments

11

What is the one neurotransmitter in skeletal muscle?

Acetylcholine

12

Acetylcholine

The ONLY one neurotransmitter in skeletal muscle

13

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

14

Where are neurotransmitters

In synaptic vesicles

15

How does a neuron move?

Electrical impulse forces calcium channels to come in and push synoptic vesicles to the end of the axon

16

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

17

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

18

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

19

Action potential

the change in electrical potential associated with the passage of an impulse along the membrane of a muscle cell or nerve cell

20

What are the only two types of cells that have action potential?

nerve cells and muscle cells

21

What happens when the acetylcholine goes to muscle fiber?

Goes to the synapse called neuromuscular junction and the muscle contracts

22

Neuromuscular junction

where neuron and muscle meet

23

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.

24

SSRI

Selective seratonin re-uptake inhibitor
ex: prozac, Zoloft, ect.

25

Sensory neurons

Going INTO the brain (Afferent)

26

Motor neurons

Going FROM brain to muscle (Efferent)

27

SAME

sensory---> afferent
motor-----> efferent

28

How many mitochondria do muscles have?

thousands

29

What does the sarcolemma consist of?

it has characteristic transverse (T) tubules which are continuous with the sarcolemma. The fibers are multi nucleic

30

What does the sarcoplasm contain?

Myofibrils made up of myofilaments
Abundant glycogen and myoglobin