Physiology Muscle
Terms
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- Contractile unit of a muscle
- sarcomere
- Sarcomere contains
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Myosin
Actin - Sacrcome extends from ____ to ______
- z-disk to z-disk
- z-line
- sarcomere boundary
- a-band
- made up of thick filaments
- 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 -
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 - 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. - 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