5.2 Card Sort

Question 1

Calcium ions (Ca^2+)

Answer 1

Released by the sarcoplasmic reticulum when a muscle is hit with an action potential

Question 2

Organelles

Answer 2

the smaller parts of a cell

Question 3

acetylcholine

Answer 3

the specific neurotransmitter that motor neurons use to tell muscles to contract

Question 4

axon terminal

Answer 4

the end of the axon of a neuron (sends the action potential away)

Question 5

muscle fiber

Answer 5

another word for a muscle cell

Question 6

motor neuron

Answer 6

neurons that deliver impulses from the brain to the muscles

Question 7

synaptic cleft

Answer 7

the space between the axon terminal of the motor neuron and a muscle fiber

Question 8

receptors

Answer 8

binding sites on the muscle fibers that receive neurotransmitters

Question 9

neurotransmitter

Answer 9

a chemical message released by neurons

Question 10

sarcolemma

Answer 10

the muscle fiber cell membrane

Question 11

neuromuscular junction

Answer 11

where a motor neuron and muscle fiber come together

Question 12

T-tubules

Answer 12

part of the sarcolemma that produces deep into the sarcoplasmic reticulum

Question 13

sarcoplasmic reticulum

Answer 13

regulates levels of calcium ions in the muscle fiber

Question 14

action potential

Answer 14

an electrical impulse that travels through a motor neuron

Question 15

myofibril

Answer 15

the individual proteins that make up a muscle fiber