Myology

Question 1

what are skeletal muscles comprised of?

Answer 1

faciscles

Question 2

each fascicle is made up of?

Answer 2

muscle cells

Question 3

another term for “muscle cells”?

Answer 3

myofiber

Question 4

T/F each skeletal muscle is an organ?

Answer 4

T

Question 5

name the types of attachments made by dense regular CT

Answer 5

tendon, aponeurosis

Question 6

cable-like attachments

Answer 6

tendon

Question 7

sheet-like attachments

Answer 7

aponeurosis

Question 8

an entire muscle comprised of fascicles is surrounded by the

Answer 8

epimysium

Question 9

each (group of muscle fibers) fascicles is surrounded by the

Answer 9

perimysium

Question 10

each muscle fibers is wrapped by the

Answer 10

endomysium

Question 11

each myofiber (cell) is composed of

Answer 11

myofibrils

Question 12

each myofibril is composed of

Answer 12

thin and thick myofilaments

Question 13

thick myofilaments are composed of the protein

Answer 13

myosin

Question 14

“the primary protein”; thin myofilaments are composed of

Answer 14

actin

Question 15

muscle cell membrane

Answer 15

sarcolemma

Question 16

the cytoplasm of a muscle cell

Answer 16

sarcoplasm

Question 17

muscle cell membrane

Answer 17

sarcoplasmic reticulum

Question 18

the function of the sarcoplasmic reticulum

Answer 18

stores calcium ions, release in muscle contraction

Question 19

function of T-tubules

Answer 19

rapidly conduct a nerve impulse to the interior of muscle cell

Question 20

definition of sarcomere

Answer 20

the functional contractile unit

Question 21

Z-disc is in the center, thin myofilament only

Answer 21

I-band

Question 22

thin and thick myofilaments, dark and light region

Answer 22

A-band

Question 23

central region in the middle of A-band, only thick myofilament

Answer 23

H-zone

Question 24

middle of H-zone, thick myofilaments attach to each other

Answer 24

M-line

Question 25

#1 in contraction

Answer 25

muscle stimulated by a nerve

Question 26

#2 in contraction

Answer 26

thick/thin myofilament slide over each other

Question 27

#3 in contraction

Answer 27

sarcomere shortens, triggers contraction

Question 28

how is a nerve impulse carried from the brain to spinal cord to muscle ?

Answer 28

axon of a motor neuron

Question 29

where does the axon meet the muscle fiber

Answer 29

neuromuscular junction

Question 30

what neurotransmitter does the axon release, in order to bind to the sarcolemma?

Answer 30

acetylcholine

Question 31

location of nerve impulse generated

Answer 31

in the sarcolemma

Question 32

what causes the sarcoplasmic reticulum to release calcium ions?

Answer 32

nerve impulse initiated by t-tubules

Question 33

why do calcium ions bind to thin myofilaments?

Answer 33

helps thick myofilament to attach to thin myofilament

Question 34

what happens as myofilaments slide over one another?

Answer 34

sarcomere shortens, contracting muscle

Question 35

what happens when nerve impulse stops?

Answer 35

calcium ions return to s.reticulum and myofilaments in resting state