Chapter 12 (Part 3)

Question 1

what is the function of transverse tubules?

Answer 1

how we bring things inside a muscle fiber

Question 2

what is the function of the sarcoplasmic reticulum within the myofibril?

Answer 2

store calcium

Question 3

what is a transverse tubule

Answer 3

invagination of the sarcolemma, continuation of the cell surface

Question 4

protein filaments make up a

Answer 4

sarcomere

Question 5

sarcomeres make up a

Answer 5

myofibril

Question 6

myofibrils make up a

Answer 6

muscle fiber

Question 7

muscle fibers make up a

Answer 7

fasicle

Question 8

fascicles make up a

Answer 8

muscle body

Question 9

a muscle body is a collection of

Answer 9

fascicles

Question 10

a fascicle is a group of

Answer 10

muscle fibers

Question 11

a muscle fiber is a group of

Answer 11

myofibrils

Question 12

a myofibril is a group of

Answer 12

sarcomere

Question 13

a sarcomere is a group of

Answer 13

protein filaments

Question 14

what is the smallest contractile unit of the muscle

Answer 14

sarcomeres

Question 15

acetylcholine binds to what kind of receptors?

Answer 15

nicotinic cholinergic

Question 16

where are the receptors found that acetylcholine binds to?

Answer 16

on the muscle fiber sarcolemma

Question 17

what happens when acetylcholine binds to receptors on the muscle fiber sarcolemma?

Answer 17

the sarcolemma depolarizes

Question 18

when the sarcolemma depolarizes, how is the signal spread throughout the muscle fiber?

Answer 18

depolarization opens voltage-gated sodium channels across the sarcolemma and down into the transverse tubules

Question 19

when the sarcolemma depolarizes, what is the function of dihydropyridine receptors?

Answer 19

open ryanodine channels to release Ca+2 from the sarcoplasmic reticulum and into the sarcoplasm

Question 20

what is the sarcolemma?

Answer 20

muscle fiber plasma membrane

Question 21

what is the sarcoplasm?

Answer 21

muscle fiber interior

Question 22

where are dihydropyridine receptors found?

Answer 22

attached to ryanodine Ca+2 channels on the sarcoplasmic reticulum

Question 23

when the sarcolemma depolarizes, what is the functino of ryanodine receptors?

Answer 23

release Ca+2 from the sarcoplasmic reticulum and into the sarcoplasm

Question 24

when the sarcolemma depolarizes, where does calcium that gets released from the sarcoplasmic reticulum bind?

Answer 24

to troponin