Exam 3 Practice Questions

Question 1

Which of the following generates force during sliding filament contraction?

Answer 1

myosin

Question 2

Which of the following binds calcium?

Answer 2

troponin

Question 3

Where is calcium stored in skeletal muscle?

Answer 3

sarcoplasmic reticulum

Question 4

Which of the following are required for actin/myosin contraction?

Answer 4

ATP and Ca

Question 5

Peter has a condition in which there is no calcium within his skeletal muscle. As a result, he has:

Answer 5

no muscle contraction

Question 6

Which of the following occurs first in contraction of
skeletal muscle:

Answer 6

motor neuron action potential

Question 7

Which of the following occurs in skeletal muscle at rest:

Answer 7

Ca storage in sarcoplasmic reticulum

Question 8

Acetylcholine (ACh) is critical for:

Answer 8

generation of sarcolemmal action potential

Question 9

A person with a mutation in actin that prevents myosin binding will have:

Answer 9

lack of muscle tone

Question 10

John is showing off for his friends and tries to use his biceps to lift the front end of a Peterbilt semi truck. This is an example of:

Answer 10

isometric contraction

Question 11

At rest, which of the following muscle proteins binds calcium:

Answer 11

none of the above; Ca is in the SR at rest

Question 12

During muscle contraction, which of the following binds ATP:

Answer 12

myosin

Question 13

When acetylcholine is bound by receptors at the sarcolemma, what happens next?

Answer 13

sarcolemmal action potential

Question 14

Acetylcholinesterase is an enzyme that breaks down acetylcholine at the neuromuscular junction. Acetylcholinesterase is important for:

Answer 14

ending muscle contraction

Question 15

Curare is a plant-derived poison, traditionally used by indigenous people of South America for arrows and blowguns. When injected, curare reversibly prevents acetylcholine from binding to its receptor at the sarcolemma.
This will:

Answer 15

prevent muscle contraction

Question 15

Curare is a plant-derived poison, traditionally used by indigenous people of South America for arrows and blowguns. When injected, curare reversibly prevents acetylcholine from binding to its receptor at the sarcolemma.
This will:

Answer 15

prevent muscle contraction

Question 16

In a skeletal muscle cell, an action potential is conducted along:

Answer 16

the sarcolemma and t tubules

Question 17

What causes action potentials in skeletal muscle cells?

Answer 17

ACh binding to its receptors

Question 18

Acetylcholinesterase degrades Ach in the neuromuscular junction. A drug that inhibits acetylcholinesterase will cause:

Answer 18

increased muscle contraction

Question 19

What protein binds calcium to activate contraction of
smooth muscle cells?

Answer 19

calmodulin

Question 20

Smooth muscle is different from skeletal muscle because:

Answer 20

gap junctions allow smooth muscle cells to communicate with each other

Question 21

Which of the following muscles elevates the ribs for inspiration/inhalation:

Answer 21

external intercostals

Question 22

What is this muscle(shoulder)?

Answer 22

deltoid

Question 23

What muscle originates at the zygomatic arch and contracts to close the mouth:

Answer 23

masseter

Question 24

What muscle is this(upper back):

Answer 24

trapezius

Question 25

Action potentials are transmitted along:

Answer 25

axons

Question 26

Which are responsible for forming the myelin sheath around neurons of the Peripheral Nervous System:

Answer 26

Schwann cells

Question 27

A motor neuron activates muscle fibers in the arm. It is part of:

Answer 27

The efferent division of the peripheral nervous system

Question 28

During the depolarization phase of an action potential:

Answer 28

Sodium (Na+) channels open in the axolemma.

Question 29

CNS neurons have a high metabolic demand. Where do they obtain glucose to support metabolism:

Answer 29

astrocytes