BSC2346 Human Anatomy and Physiology I
Module 04 Quiz
Question 1
Which choice best describes the function T-tubules have within muscle contraction?
Answers:
Transmit the action potential deep into the muscle cell
Store and release calcium ions into the cell interior for muscle contraction
Help align the thick and thin filament for contraction
Store glycogen
Question 2
Which of the following proteins blocks the active site on actin during relaxation?
Answers:
Tropomyosin
Myosin
Actin
Troponin
Question 3
Which factor is required to allow for muscle contraction?
Answers:
Acetylcholine binds to the motor neuron
Cross bridging of the thick and thin filament
Sodium ions to be present within the muscle fiber’s cytoplasm
Actin heads bind to troponin filament
Question 4
Which statement is true regarding muscle contraction?
Answers:
The power stroke occurs when the thick filament binds to the thin filament
The T-tubules store the calcium ions within the internal part of the muscle cell
Tropomyosin protein binds to the actin protein
ATP is needed to release the thick filament from the thin filament
Question 5
Which statement is NOT true regarding muscle contraction?
Answers:
Tropomyosin protein covers the binding sites for the thick filament on the actin protein
ATP is needed for the thick filament to bind to the thin filament
The sarcoplasmic reticulum stores the calcium ions that are released within the muscle cell
Acetylcholine is the neurotransmitter that binds to the sarcolemma
Question 6
Which of the following passes through the sarcoplasm, causing the sarcoplasmic reticulum to open its “gates”?
Answers:
Sodium
ATP
Action potential
Calcium
Question 7
Which of the following is true of muscle contraction?
Answers:
The H-zone lengthens during contraction.
The Z-disks move farther apart during contraction.
ATP is converted to ADP during a power stroke.
The T-tubules release stored sodium and magnesium to initiate an action potential.
Question 8
Which of the following substances is the neurotransmitter released from motor neurons initiating muscle contraction?
Answers:
Norepinephrine
Acetylcholinesterase
Dopamine
Acetylcholine
Question 9
What statement is true of smooth muscle?
Answers:
It has a striated appearance when viewed under a microscope
It only contracts through conscious control
Its contraction is controlled by the same mechanism as skeletal muscle
It is found mainly within internal organs such as the bladder and uterus
Question 10
Fast oxidative muscle fibers do not fatigue quickly due to its rich supply of myoglobin.
Answers:
True
False
Question 11
The motor end plate is the:
Answers:
Open space where neurotransmitters move freely
Portion of a neuron that contains vesicles of acetylcholine
Depression on the sarcolemma where the synaptic knob fits
End of the motor neuron that looks like a bulb shape and releases acetylcholine
Question 12
Which of the following is true of skeletal muscle tissue?
Answers:
Each cell has a single nucleus.
A skeletal muscle fiber typically contains a sarcolemma, t-tubules, and myofibrils.
Skeletal muscle cells have the same shape as smooth muscle cells.
A muscle cell is composed of hundreds of muscle fibers.
Question 13
Anaerobic respiration produces lactic acid as a by-product but creates more ATP for muscle contraction when compared to aerobic respiration.
Answers:
True
False
Question 14
Which of the following directly covers a skeletal muscle?
Answers:
Sarcolemma
Epimysium
Perimysium
Endomysium
Question 15
Which statement is true regarding slow oxidative muscle fibers?
Answers:
They don’t contain myoglobin
Appears white in color within a specimen
It is fatigue resistant
They can contract only for short period of times
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