Chapter 10 MCQ from Textbook Flashcards
Muscle that has a striped appearance is described as being…
a. elastic
b. nonstriated
c. excitable
d. striated
d) Striated
Which element is important in directly triggering contraction?
a. sodium (Na+)
b. calcium (Ca++)
c. potassium (K+)
d. chloride (Cl-)
b) Calcium
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
c) at rest, uses shielding proteins to cover actin- binding sites
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
b) filament, myofibril, muscle fiber, fascicle
Depolarization of the sarcolemma means what?
the inside of the membrane has become less negative as sodium ions accumulate
In relaxed muscle, the myosin-binding site on actin is blocked by ________.
a. titin
b. troponin
c. myoglobin
d. tropomyosin
d) Tropomyosin
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
d) Calcium ion levels rise
The cell membrane of a muscle fibre is called…
a. myofibril
b. sarcolemma
c. sarcoplasm
d. myofilament
b) Sarcolemma
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
c) calcium ions are actively transported into the sarcoplasmic reticulum
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
c) Calcium ions bind to troponin
Thin and thick filaments are organized into functional units called…
a. myofibrils
b. myofilaments
c. T-tubules
d. sarcomeres
d) Sarcomeres
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
c) Contraction phase
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
b) exhaustion of energy reserves and buildup of lactic acid levels
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
a) anaerobic metabolism in the muscles of the sprinter
What aspect of creatine phosphate allows it to supply energy to muscles?
a. ATPase activity
b. phosphate bonds
c. carbon bonds
d. hydrogen bonds
b) Phosphate bonds
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
d) None of the above
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
b) 20 percent fast-twitch muscle fibres and 80 percent slow-twitch muscle fibres
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
a) 80 percent fast-twitch muscle fibres and 20 percent slow-twitch muscle fibres
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.
c) Fast fibres have large glycogen reserves.
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
a) Slow fibres have a small network of
capillaries.
Cardiac muscles differ from skeletal muscles in that they ________.
a. are striated
b. utilize aerobic metabolism
c. contain myofibrils
d. contain intercalated discs
d) Contain intercalated discs
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
c) Stop contracting
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
a) lack myofibrils
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.
a) They are resistant to fatigue.
From which embryonic cell type does muscle tissue develop?
a. ganglion cells
b. myotube cells
c. myoblast cells
d. satellite cells
c) Myoblast cells
Which cell type helps to repair injured muscle fibres?
a. ganglion cells
b. myotube cells
c. myoblast cells
d. satellite cells
d) Satellite cells
