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20 Cards in this Set

  • Front
  • Back
Contractile unit of a muscle
sarcomere
Sarcomere contains
Myosin
Actin
Sacrcome extends from ____ to ______
z-disk to z-disk
z-line
sarcomere boundary
a-band
made up of thick filaments
I-band
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
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
Voluntary muscle includes:
a. smooth muscle
b. skeletal muscle
c. cardiac muscle
d. both a & b
e. a,b, & c
b. skeletal muscle
striated muscle include:
a. skeletal
b. cardiac
c. smooth
d. a & b
e. a,b,c
d. both skeltal and cardiac muscle
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
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
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
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
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
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
The thin filaments of a muscle filament are _____ filaments
a. actin
b. troponin
c. tropomyosin
d. myosin
e. none of the above
a. actin
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
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
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