Answer Options:
A. a first-class lever
B. a fourth-class lever
C. a third-class lever
D. a second-class lever
Answer: A. a first-class lever
Question: What produces the striations of a skeletal muscle cell?
Answer Options:
the T tubules
a difference in the thickness of the sarcolemma
the sarcoplasmic reticulum
the arrangement of myofilaments
Answer: the arrangement of myofilaments
Question: Which of the following is the correct sequence of events for muscle contractions?
Answer Options:
neurotransmitter release, muscle cell action potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke
neurotransmitter release, motor neuron action potential, muscle cell action potential
, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke
muscle cell action potential, neurotransmitter release, ATP-driven power stroke, calcium ion release from SR, sliding of myofilaments
Answer: neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke
Question: What is a muscle that provides the major force for producing a specific movement called?
Answer Options:
A. a fixator
B. a synergist
C. an antagonist
D. an agonist
Answer: D. an agonist
Question: What structure in skeletal muscle cells functions in calcium storage?
Answer Options:
a) sarcoplasmic reticulum
b) mitochondria
c) myofibrillar network
d) intermediate filament network
Answer: a) sarcoplasmic reticulum
Question: What structure in skeletal muscle cells functions in calcium storage?
Answer Options:
sarcoplasmic reticulum
mitochondria
myofibrillar network
intermediate filament network
Answer: sarcoplasmic reticulum
Question: The names of muscles often indicate the action of the muscle. What does the term rectus mean?
Answer Options:
A. The muscle functions as a synergist.
B. The muscle is a fixator and stabilizes a bone or joint.
C. The muscle flexes and rotates a region.
D. The muscle elevates.
Answer: Not visible. (The correct answer is: The term “rectus” indicates that the muscle fibers run straight or parallel to the midline of the body.)
Question: Tendon sheaths ________.
Answer Options:
are lined with dermalogic connective tissue
help anchor the tendon to the muscle
act as friction-reducing structures
are extensions of periosteum
Answer: act as friction-reducing structures
Question: Muscle power does not depend on the direction of the fascicles.
Answer Options:
A. True
B. False
Answer: B. False
Question: Immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called the ________ period during which the neurotransmitter is released by exocytosis, diffuses across the synaptic cleft, and binds to its receptors.
Answer Options:
relaxation
latent
contraction
refractory
Answer: latent
Question: What structure in skeletal muscle cells functions in calcium storage?
Answer Options:
a) sarcoplasmic reticulum
b) mitochondria
c) myofibrillar network
d) intermediate filament network
Answer: a) sarcoplasmic reticulum
Question: Which of the following surrounds the individual muscle cell?
Answer Options:
perimysium
epimysium
endomysium
fascicle
Answer: endomysium
Question: “Capital” is sometimes defined as funds supplied to a firm by investors.
Answer Options
a. True
b. False
Answer: a. True
Question: The extrinsic eye muscle motor units contain only 8 to 12 muscle cells and in some cases as few as 2 or 3 muscle cells.
Answer Options:
True
False
Answer: True
Question: What is the functional unit of a skeletal muscle called?
Answer Options:
a) sarcomere
b) myofibril
c) myofilament
d) the sarcoplasmic reticulum
Answer: a) sarcomere (User’s incorrect answer: b) myofibril)