Chapter 10 MCQ from Textbook

Question 1

Muscle that has a striped appearance is described as being…
a. elastic
b. nonstriated
c. excitable
d. striated

Answer 1

d) Striated

Question 2

Which element is important in directly triggering contraction?
a. sodium (Na+)
b. calcium (Ca++)
c. potassium (K+)
d. chloride (Cl-)

Answer 2

b) Calcium

Question 3

Which of the following properties is not common to all three muscle tissues?
a. excitability
b. the need for ATP
c. at rest, uses shielding proteins to cover actin- binding sites
d. elasticity

Answer 3

c) at rest, uses shielding proteins to cover actin- binding sites

Question 4

he correct order for the smallest to the largest unit of organization in muscle tissue is __________.
a. fascicle, filament, muscle fiber, myofibril
b. filament, myofibril, muscle fiber, fascicle
c. muscle fiber, fascicle, filament, myofibril
d. myofibril, muscle fiber, filament, fascicle

Answer 4

b) filament, myofibril, muscle fiber, fascicle

Question 5

Depolarization of the sarcolemma means what?

Answer 5

the inside of the membrane has become less negative as sodium ions accumulate

Question 6

In relaxed muscle, the myosin-binding site on actin is blocked by ________.
a. titin
b. troponin
c. myoglobin
d. tropomyosin

Answer 6

d) Tropomyosin

Question 7

According to the sliding glament model, binding sites on actin open when ________.
a. creatine phosphate levels rise
b. ATP levels rise
c. acetylcholine levels rise
d. calcium ion levels rise

Answer 7

d) Calcium ion levels rise

Question 8

The cell membrane of a muscle fibre is called…
a. myofibril
b. sarcolemma
c. sarcoplasm
d. myofilament

Answer 8

b) Sarcolemma

Question 9

Muscle relaxation occurs when…
a. calcium ions are actively transported out of the sarcoplasmic reticulum

b. calcium ions diffuse out of the sarcoplasmic
reticulum

c. calcium ions are actively transported into the sarcoplasmic reticulum

d. calcium ions diffuse into the sarcoplasmic reticulum

Answer 9

c) calcium ions are actively transported into the sarcoplasmic reticulum

Question 10

During muscle contraction, the cross-bridge detaches when…

a. the myosin head binds to an ADP molecule

b. the myosin head binds to an ATP molecule

c. calcium ions bind to troponin

d. calcium ions bind to actin

Answer 10

c) Calcium ions bind to troponin

Question 11

Thin and thick filaments are organized into functional units called…
a. myofibrils
b. myofilaments
c. T-tubules
d. sarcomeres

Answer 11

d) Sarcomeres

Question 12

During which phase of a twitch in a muscle fibre is tension the greatest?
a. resting phase
b. repolarization phase
c. contraction phase
d. relaxation phase

Answer 12

c) Contraction phase

Question 13

Muscle fatigue is caused by ________.
a. buildup of ATP and lactic acid levels

b. exhaustion of energy reserves and buildup of lactic acid levels

c. buildup of ATP and pyruvic acid levels

d. exhaustion of energy reserves and buildup of pyruvic acid levels

Answer 13

b) exhaustion of energy reserves and buildup of lactic acid levels

Question 14

A sprinter would experience muscle fatigue sooner than a marathon runner due to ________.
a. anaerobic metabolism in the muscles of the sprinter

b. anaerobic metabolism in the muscles of the marathon runner

c. aerobic metabolism in the muscles of the sprinter

d. glycolysis in the muscles of the marathon runner

Answer 14

a) anaerobic metabolism in the muscles of the sprinter

Question 15

What aspect of creatine phosphate allows it to supply energy to muscles?
a. ATPase activity
b. phosphate bonds
c. carbon bonds
d. hydrogen bonds

Answer 15

b) Phosphate bonds

Question 16

Drug X blocks ATP regeneration from ADP and phosphate. How will muscle cells respond to this drug?
a. by absorbing ATP from the bloodstream
b. by using ADP as an energy source
c. by using glycogen as an energy source
d. none of the above

Answer 16

d) None of the above

Question 17

The muscles of a professional sprinter are most likely to have ________.
a. 80 percent fast-twitch muscle fibres and 20 percent slow-twitch muscle fibres

b. 20 percent fast-twitch muscle fibres and 80 percent slow-twitch muscle fibres

c. 50 percent fast-twitch muscle fibres and 50 percent slow-twitch muscle fibres

d. 40 percent fast-twitch muscle fibres and 60 percent slow-twitch muscle fibres

Answer 17

b) 20 percent fast-twitch muscle fibres and 80 percent slow-twitch muscle fibres

Question 18

The muscles of a professional marathon runner are most likely to have ________.

a. 80 percent fast-twitch muscle fibres and 20 percent slow-twitch muscle fibres

b. 20 percent fast-twitch muscle fibres and 80 percent slow-twitch muscle fibres

c. 50 percent fast-twitch muscle fibres and 50 percent slow-twitch muscle fibres

d. 40 percent fast-twitch muscle fibres and 60 percent slow-twitch muscle fibres

Answer 18

a) 80 percent fast-twitch muscle fibres and 20 percent slow-twitch muscle fibres

Question 19

Which of the following statements is true?
a. Fast fibres have a small diameter.
b. Fast fibres contain loosely packed myogfirils.
c. Fast fibres have large glycogen reserves.
d. Fast fibres have many mitochondria.

Answer 19

c) Fast fibres have large glycogen reserves.

Question 20

Which of the following statements is false?
a. Slow fibres have a small network of
capillaries.
b. Slow fibres contain the pigment myoglobin.
c. Slow fibres contain a large number of
mitochondria.
d. Slow fibres contract for extended periods

Answer 20

a) Slow fibres have a small network of
capillaries.

Question 21

Cardiac muscles differ from skeletal muscles in that they ________.
a. are striated
b. utilize aerobic metabolism
c. contain myofibrils
d. contain intercalated discs

Answer 21

d) Contain intercalated discs

Question 22

If cardiac muscle cells were prevented from undergoing aerobic metabolism, they ultimately would ________.
a. undergo glycolysis
b. synthesize ATP
c. stop contracting
d. start contracting

Answer 22

c) Stop contracting

Question 23

Smooth muscles differ from skeletal and cardiac muscles in that they ________.
a. lack myofibrils
b. are under voluntary control
c. lack myosin
d. lack actin

Answer 23

a) lack myofibrils

Question 24

Which of the following statements describes smooth muscle cells?

a. They are resistant to fatigue.
b. They have a rapid onset of contractions.
c. They cannot exhibit tetanus.
d. They primarily use anaerobic metabolism.

Answer 24

a) They are resistant to fatigue.

Question 25

From which embryonic cell type does muscle tissue develop?
a. ganglion cells
b. myotube cells
c. myoblast cells
d. satellite cells

Answer 25

c) Myoblast cells

Question 26

Which cell type helps to repair injured muscle fibres?
a. ganglion cells
b. myotube cells
c. myoblast cells
d. satellite cells

Answer 26

d) Satellite cells