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Anatomy and Physiology 232 Final Exam Questions And All Correct Answers.
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Three types of muscle in the human body are the following except: a. striated b. cardiac c. smooth d. celiac - Answer d. celiac The following are FUNCTIONAL characteristics of muscle except: a. heat production b. communication c. excitability d. extendability - Answer C. communica...

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  • September 3, 2024
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  • 2024/2025
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Anatomy and Physiology 232 Final Exam
Questions And All Correct Answers.
Three types of muscle in the human body are the following except:

a. striated

b. cardiac

c. smooth

d. celiac - Answer d. celiac



The following are FUNCTIONAL characteristics of muscle except:

a. heat production

b. communication

c. excitability

d. extendability - Answer C. communication



A muscle cell membrane is:

a. a sarcolemma

b. made of dense connective tissue

c. larger the muscle organ itself

d. non permeable - Answer a. a sarcolemma



The 2 myofilaments in a myofibril are made mostly of proteins called

a. actin and myosin

b. myoglobin and glycogen

c. troponin and tropomyosin

d. sarcosin and mysium - Answer a. actin and myosin

,The smallest unit of muscle contraction is a

a. contraction

b. sarcomere

c. meromysium

d. myomere - Answer b. sarcomere



The elastic protein which attaches thick and thin filaments to the Z discs is called:

a. titin

b. thylium

c. tytanium

d. tritium - Answer a. titin



The "sliding filament" model of contraction involves:

a. actin and myosin sliding past each other and partially overlapping

b. the Z discs sliding over the myofilaments

c. actin and myosin lengthening in order to slide past each other

d. the shortening of thick filaments so that thin filaments slide past - Answer a. actin and myosin sliding
past each other and partially overlapping



The "triad" is formed by:

a. 3 separate muscle cells

b. myosin actin and tropomyosin

c. a "T" tubule and 2 adjacent terminal cisternae

d. 2 myofibrils and a Z disc - Answer c. "T" tubule and 2 adjacent terminal cisternae



The sarcoplasmic reticulum

a. wraps around a myofibril

b. is a network of tubules surrounding each separate myofibrl.

c. is a reservoir for Ca+

, d. all of the above - Answer d. all of the above



"T" tubules:

a. Conduct the electrical impulse into the muscle cell

b. are a part of the "triad"

c. penetrate into the myofibril

d. all of the above - Answer d. all of the above



A Motor Unit:

a. is a motor neuron and all the muscle fibers it supplies

b. an electrical impulse detection mechanism which only fires in smooth and cardiac muscle

c. part of the central nervous system and communicates with muscle through convergence

d. both a motor and sensory nerve which receives impulses from a muscle twitch - Answer a. is a motor
neuron and all the muscle fibers it supplies



When a muscle cell membrane FIRST receives an electrical impulse to initiate a contraction:

a. it completely relaxes the muscle

b. the impulse must first reverse itself before it propagates

c. it is called repolarization

d. it is called depolarization - Answer d. it is called depolarization



Which of the following is FALSE regarding a muscle contraction:

a. ACh is a neurotransmitter

b. Ca+ floods into the terminal axon when an impulse reaches the terminal end bulb

c. muscles will only contract when Na+ is present

d. muscles typically repolarize after contracting - Answer c. muscles will only contract when Na+ is
present



The "Resting potential" of a muscle cell membrane:

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