test 1

Question 0

the neurotransmitter found in neuromuscular junctions

Answer 0

acetycholine

ACh

Question 1

which type of muscle tissue has the greatest effect on the body’s heat production

Answer 1

skeletal muscle

Question 2

when an action potential arrives at the axon terminal of a motor neuron, which ion channels open?

Answer 2

voltage-gated calcium channels

Question 3

what means of membrane transport is used to release the neurotransmitter into the synaptic cleft?

Answer 3

Exocytosis

Question 4

How is acetycholine ACh removed from the synaptic cleft?

Answer 4

acetycholinesterase (AChE; an enzyme)

Question 5

the action potential on the muscle cells leads to contraction due to:

Answer 5

the release of calcium ions

Question 6

where are calcium ions stored in the muscle cell

Answer 6

terminal cisternae of the sarcoplasmic reticulum

Question 7

sarcomere is best defined as

Answer 7

repeating unit of striated muscle

Question 8

when a muscle contraction develops tension but doesn’t shorten the muscle is called:

Answer 8

isometric

Question 9

skeletal muscle does each of the following except

Answer 9

pump blood

Question 10

muscle fatigue occurs due to a buildup of _____ and ______ in pH

Answer 10

lactic acid; decrease

Question 11

The soleus muscle is very red in color. Which of these statements about soleus muscle fibers is false

Answer 11

they are large in diameter

Question 12

Which thick filament binds to actin once its active binding sites are exposed?

Answer 12

Myosin

Question 13

All of the following are found in both skeletal and cardiac muscle fibers except:

Answer 13

intercalated discs

Question 14

the biochemical reaction that consumes the majority of a muscles ATP is the

Answer 14

actin myosin cross-bridge cycle