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20 Cards in this Set
- Front
- Back
Contractile unit of a muscle
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sarcomere
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Sarcomere contains
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Myosin
Actin |
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Sacrcome extends from ____ to ______
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z-disk to z-disk
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z-line
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sarcomere boundary
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a-band
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made up of thick filaments
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I-band
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edge of sarcomere
light area each 1/2 of I-band belongs to a different sarcomere z-disk in middle |
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The myosin-linked control system on which calcium acts on myosin to promote contraction is characteristic of :
a. skeletal muscle b. cardiac muscle c. smooth muscles d. a & B e. a,b, & c |
c. smooth muscle
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The muscles that control the opening of the pupil of the eye or the diameter of blood vessels are ______ muscles
a. smooth b. skeletal c. cardiac d. none of the above |
a. smooth
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Voluntary muscle includes:
a. smooth muscle b. skeletal muscle c. cardiac muscle d. both a & b e. a,b, & c |
b. skeletal muscle
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striated muscle include:
a. skeletal b. cardiac c. smooth d. a & b e. a,b,c |
d. both skeltal and cardiac muscle
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The entire skeletal muscle is covered by a layer of connective tissue known as the:
a. sarcolemma b. epimysium c. perimysium d. endomysium e. both a & b, but not a or d |
b. epimysium
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The functional and anatomical unit of a skeletal muscle is the:
a. sacrcomere b. actin filament c. crossbridge d. h-zone e. none of the above |
a. sarcomere
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The dark and light bands in striated muscle are composed of:
a. different kinds of protein filaments b. layers of carbohydrates c. alternating muscle and connective tissue d. layers of adipose tissue interspersed with muscle tissue e. ridges similiar to those that appear on fingerprints |
a. different kinds of protein filaments
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The region of the muscle where only thin filaments are located is called the:
a. A-band b. B-band c. I-band d. M-line e. Z-line |
c. I-band
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During Muscle contraction:
a. the thin fibers shortens b. the thick fiber shortens c. both fibers shorten d. neither fiber shortens e. both fibers lengthen |
d. neither fiber shortens
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During contraction:
a. the A-band remains the same and the I- Band shortens b. the I band remains the same and the A-band shortens c. both A-band and I-band shorten d. neither A-band nor the I-band changes e. none of the above |
a. the A-band remains the same and the I- Band shortens
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The thin filaments of a muscle filament are _____ filaments
a. actin b. troponin c. tropomyosin d. myosin e. none of the above |
a. actin
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The transverse tubular system:
a. speeds the transmission of an A.P. down the length of muscle b. activates only one myofibril at a time c. is a device that allows the deeper muscle myofibrils to receive the effects of AP's quickly d. enables the rapid transport of lactic acid away from the muscle e. allows for individual sarcomeres to contract |
c. is a device that allows the deeper muscle myofibrils to receive the effects of AP's quickly
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In a resing muscle cell, calcium ions are highly concentrated within:
a. sarcoplasmic reticulum b. terminalcisternae c. the interior of the myofibrils e. a,b and c |
d. a and b SR and terminal cisternai
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Creatine Phosphate:
a. is an inhibitor b. blocks receptor sites c. assists in dissipating lactic acid d. is a chemica that stores ATP |
d. is a chemica that stores ATP
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