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BIOL G220 Exam 2 Review C
Test Description: Skeletal and Muscular Organization and Function
Instructions: Answer all questions to get your test result.
1) Muscles are made of different types of ______, as they occupy the _____ level of organization
A
Organs, Organ Systems
B
molecules, cellular
C
Tissues, organ
D
cells, Tissues
2) Muscles are divided into bundles of muscle fibers called _____ by membranes called ____
A
Fascicles, Perimysium
B
Myofibrils, Endomysium
C
Myofibrils, Epimysium
D
Fascicles, Epimysium
3) muscle fibers, representing the ____ level of organization, are separated from one another by
A
organ, epimysium
B
tissue, perimysium
C
molecular, hypomysium
D
cellular, endomysium
4) within the muscle fibers are bundles of myofilaments called ____, which represent the ____ level of organization
A
myofibrils, molecular
B
mwarks, subatomic
C
myostriations, molecular
D
myosin, atomic
5) myofibrils are surrounded by saclike organelles simmilar to ER called ______
A
sarcolemic vessicles
B
endosarcic plasmodium
C
sarcoplasmic reticulum
D
Folger's apparatus
6) ___, along with their two adjoining terminal cisternae (of the SR) make up the -Triad-
A
Obtuse Canals
B
Inverse Chambers
C
Transverse Tubules
D
Universal Passages
7) The transverse tubules and Sarcoplasmic Reticulum are involved in
A
Eliminating Waste
B
Triggering Contractions
C
Storing Nutrients
D
Delivering Energy
8) The thick filaments are made exclusively of ___ while the thin filaments are mostly ____
A
Tropomyosin, Troponin
B
Myosin, Actin
C
Carbon, Nitrogen
D
Actin, Myosin
9) Contractile units called _____ shorten when thick and thin filaments slide along one another
A
Transverse Tubules
B
Myofibers
C
Sarcomeres
D
Myofibrils
10) The ends of the sarcomere are pulled together by the action of _____ heads attaching to ____ binding sites
A
Actin, Myosin
B
Myosin, Actin
C
Troponin, Tropomyosin
D
Titin, Sarcosome
11) To initiate contractile shortening of the sarcomere, ___ is released from the sarcoplasmic reticulum to remove ___ from the binding sites on the thin filaments
A
Sodium Ions, Actin
B
Calcium Ions, Tropomyosin
C
Phosphate Ions, Troponin
D
Chloride Ions, Myosin
12) to reset the myosin heads so that they can attach to the actin again requires
A
ATM
B
MTV
C
ATP
D
ETC
13) The aligned z-discs on adjacent microfibrils create the visible ___ in skeletal muscle
A
striations
B
branching
C
intercalations
D
membranes
14) A group of muscle fibers that are all innervated by the same motor neuron are called
A
contractile collectives
B
motor units
C
functional groups
D
Billy Bob or possibly Steve
15) muscle fibers contract
A
in sequence, one sarcomere after another along the myobibril
B
in an all-or-nothing manner
C
with more power as the amplitude of the stimulus increases
D
to varying degrees depending on a variety of factors
16) one way to increase the tension of muscle contraction is by increasing the ____ of the stimulus, in a process of TEMPORAL SUMMATION
A
post synapic effect
B
penetration
C
frequency
D
amplitudge
17) tension in a muscle can also be increased by recruiting additional motor units in a process called
A
spatial or quantal summation
B
Extramuscular summation
C
temporal summation
D
Hypercontractility
18) In the muscles of the calf and lower back, ___ fibers predominate
A
Fast Aerobic
B
Intermediate
C
Slow Aerobic
D
Fast Anerobic
19) in the muscles that move the eye and eyelid, one finds almost all of the fibers are
A
Fast Anerobic
B
Slow Aerobic
C
Fast Aerobic
D
Intermediate
20) muscles attach to the relatively immobile point at the ___, and to the relatively mobile point at the ___
A
origin, insertion
B
aponeurosis, tendon
C
insertion, origin
D
ligament, tendon
*select an answer for all questions
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