Answer Options:
eccrine and apocrine
holocrine and mammary
sebaceous and merocrine
mammary and ceruminous
Answer: eccrine and apocrine
Question: Although all skeletal muscles have different shapes, the fascicle arrangement of each muscle is exactly the same.
Answer Options:
A. True
B. False
Answer: B. False
Question: Which of the following statements best describes angular movements?
Answer Options:
They occur only between bones with flat articular processes.
They allow movement only in one plane.
They allow movement in several planes.
They change [increase or decrease] the angle between two bones.
Answer: They change [increase or decrease] the angle between two bones.
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: Burns are devastating and debilitating because of loss of fluids and electrolytes from the body. How do physicians estimate the extent of burn damage associated with such dangerous fluid loss?
Answer Options:
by using the “rule of nines”
through blood analysis
by measuring urinary output and fluid intake
by the size of the burn
Answer: by using the “rule of nines”
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:
intermediate filament network
sarcoplasmic reticulum
myofibrillar network
mitochondria
Answer: sarcoplasmic reticulum
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
contraction
latent
refractory
Answer: latent
Question: The process of bones increasing in width is known as _______.
Answer Options:
a) epiphyseal plate closure
b) concentric growth
c) appositional growth
d) closing of the epiphyseal plate
Answer: c) appositional growth
Question: Although all skeletal muscles have different shapes, the fascicle arrangement of each muscle is exactly the same.
Answer Options:
A. True
B. False
Answer: B. False
Question: Muscles that help maintain upright posture are flexors.
Answer Options:
A. True
B. False
Answer: B. False
Question: What is the role of tropomyosin in skeletal muscles?
Answer Options:
Tropomyosin is the receptor for the motor neuron neurotransmitter.
Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
Tropomyosin is the chemical that activates the myosin heads.
Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules.
Answer: Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
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)
Question: Muscle power does not depend on the direction of the fascicles.
Answer Options:
A. True
B. False
Answer: B. False
Question: What is the role of tropomyosin in skeletal muscles?
Answer Options:
Tropomyosin is the receptor for the motor neuron neurotransmitter.
Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
Tropomyosin is the chemical that activates the myosin heads.
Answer: Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
Question: Rigor mortis occurs because ________.
Answer Options:
proteases are beginning to break down, thus preventing a flow of calcium ions
sodium ions leak into the muscle causing continued contractions
no ATP is available to release attached actin and myosin molecules
the cells are dead
Answer: no ATP is available to release attached actin and myosin molecules
Question: The names of muscles often indicate the action of the muscle. What does the term levator 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: D. The muscle elevates.
Question: Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle?
Answer Options:
a) cholinesterase
b) norepinephrine
c) gamma-aminobutyric acid
d) acetylcholine
Answer: d) acetylcholine
Question: Both first- and second-class levers operate at a mechanical disadvantage.
Answer Options:
A. True
B. False
Answer: B. False
Question: What is the role of troponin in skeletal muscles?
Answer Options:
Troponin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules.
Troponin is the chemical that activates the myosin heads.
Troponin is the receptor for the motor neuron neurotransmitter.
Troponin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
Answer: Troponin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules.
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: Muscle power does not depend on the direction of the fascicles.
Answer Options:
A. True
B. False
Answer: B. False
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 an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle?
Answer Options:
a) cholinesterase
b) norepinephrine
c) gamma-aminobutyric acid
d) acetylcholine
Answer: d) acetylcholine