Question: One way to increase muscle tension is to
Answer Options:
decrease the frequency of stimulation
begin the contraction with abnormally short sarcomeres
recruit more motor units
Answer: recruit more motor units
Question: To demonstrate wave summation in a lab you would vary (change) the
Answer Options:
frequency of stimulation to the muscle
degree of muscle stretch
amount of voltage you apply to the muscle
number of motor units activated
Answer: frequency of stimulation to the muscle
Question: If a sarcomere of a skeletal muscle cell is stretched beyond its optimum resting length
Answer Options:
the muscle will contract more strongly
the muscle will not contract properly
the cell’s membrane cannot be depolarized
Answer: the muscle will not contract properly
Question: Which of the following are functions of ATP in contracting muscle? You may select more than one option – choose all that apply.
Answer Options:
placing the myosin heads into their high energy position
release of acetylcholine into the synaptic cleft
detachment of myosin cross bridges from actin
pumping calcium into the sarcoplasmic reticulum
Answer: placing the myosin heads into their high energy position
detachment of myosin cross bridges from actin
pumping calcium into the sarcoplasmic reticulum
Question: The process of anaerobic glycolysis generates
Answer Options:
1 molecule of ATP
32-36 molecules of ATP
2 molecules of ATP
1.21 gigawatts of energy
Answer: 2 molecules of ATP
Question: What byproduct is made during anaerobic glycolysis?
Answer Options:
oxygen
glucose
lactic acid
Answer: lactic acid
Question: A muscle group that works with and assists the action of a prime mover (agonist) is a/n:
Answer Options:
fixator
synergist
antagonist
protagonist
Answer: synergist
Question: When acting on a light load a muscle will contract with __ velocity.
Answer Options:
low (slow)
high (fast)
zero
Answer: high (fast)
Question: The fastest way for a muscle cell to generate ATP is by
Answer Options:
direct phosphorylation from creatine phosphate
aerobic respiration
ATPase activity
anaerobic glycolysis
Answer: direct phosphorylation from creatine phosphate
Question: Muscles used constantly throughout the day to maintain posture are likely to contain a high proportion of
Answer Options:
slow oxidative fibers
smooth muscle fibers
fast glycolytic fibers
Answer: slow oxidative fibers
Question: Lifting a weight by flexing the biceps brachii is a demonstration of which kind of lever system?
Answer Options:
Lever 2000
3rd class lever
2nd class lever
1st class lever
Answer: 3rd class lever
Question: The action of the deltoid muscle is to abduct the arm. The latissimus dorsi muscle is an antagonist muscle to the deltoid. Therefore, the action of the latissimus dorsi is to
Answer Options:
extend the arm
flex the arm
abduct the arm
adduct the arm
Answer: adduct the arm
Question: In skeletal muscle cells, calcium binds to _______ In smooth muscle cells, calcium binds to _______ .
Answer Options:
actin, myosin
calmodulin, troponin
troponin, tropomyosin
troponin, calmodulin
Answer: troponin, calmodulin
Question: Smooth muscles are stimulated by which of the following neurotransmitters?
Answer Options:
norepinephrine only
acetylcholine only
both acetylcholine and norepinephrine
Answer: both acetylcholine and norepinephrine
Question: A muscle disorder that results from a mutation on the X chromosome and causes reduction in the number of muscle fibers throughout the striated muscles of the body is called
Answer Options:
muscle cramps
muscle atrophy
Duchenne muscular dystrophy
myasthenia gravis
Answer: Duchenne muscular dystrophy
Question: Bonus question! Name the tissue that forms an indirect attachment from muscle to bone.
Answer Options:
ligament
trabeculae
tendon
tight junction
Answer: tendon