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Muscular System
Test Description: Muscular System
Instructions: Answer all questions to get your test result.
1) Muscle tissue has all of the following properties except ________.
A
contractibility
B
excitibility
C
secretion
D
extensibility
2) Hypothetically, if a muscle were stretched to the point where thick and thin filaments no longer overlapped, ________.
A
cross bridge attachment would be optimum because of all the free binding sites on actin
B
maximum force production would result because the muscle has a maximum range of travel
C
no muscle tension could be generated
D
ATP consumption would increase because the sarcomere is trying to contract
3) Smooth muscle is characterized by all of the following except ________.
A
there are noncontractile intermediate filaments that attach to dense bodies within the cell
B
it appears to lack troponin
C
there are no sacromeres
D
there are more thick filaments than thin filaments
4) What is the role of calcium ions in muscle contraction?
A
reestablish glycogen stores
B
bind to regulatory sites on troponin to remove contraction inhibition
C
increase levels of myoglobin
D
form hydroxyapatite crystals
5) Rigor mortis occurs because ________.
A
proteins are beginning to break down, thus preventing a flow of calcium ions
B
sodium ions leak out of the muscle
C
the cells are dead
D
no ATP is available to release attached actin and myosin molecules
6) In an isotonic contraction, the muscle ________.
A
rapidly resynthesizes creatine phosphate and ATP
B
does not change in length but increases tension
C
changes in length and moves the load
D
never converts pyruvate to lactate
7) Immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called the ________ period during which the events of excitation-contraction coupling occur.
A
latent
B
relaxation
C
contration
D
refractory
8) Which muscle cells have the greatest ability to regenerate?
A
skeletal
B
cardiac
C
no muscle can regenerate
D
smooth
9) What structure in skeletal muscle cells functions in calcium storage?
A
myofibrillar network
B
intermediate filament network
C
sarcoplasmic reticulum
D
mitochondria
10) Myoglobin ________.
A
produces the end plate potential
B
breaks down glycogen
C
is a protein involved in the direct phosphorylation of ADP
D
stores oxygen in muscle cells
11) A sarcomere is the distance between two ________.
A
I bands
B
Myosin
C
two Z-discs
D
A bands
12) The ________ contains only the actin filaments.
A
myosin
B
I band
C
A band
D
z disc
13) The thicker filaments are the ________ filaments.
A
tropin
B
myosin
C
actin
D
troponin
14) The stimulus above which no stronger contraction can be elicited, because all motor units are firing in the muscle.
A
Maximal Stimulus
B
Wave summation
C
Threshold Stimulus
D
Tetanus
15) Continued sustained smooth contraction due to rapid stimulation.
A
Maximal Stimulus
B
Tetanus
C
Treppe
D
Wave Summation
16) Serves as the actual trigger for muscle contraction by removing the inhibition of the troponin molecules.
A
Creatine Phosphate
B
Calcium ions
C
Acetylcholine
D
Acetylcholinase
17) Used to convert ADP to ATP by transfer of a high-energy phosphate group. A reserve high-energy compound.
A
Acetylcholinase
B
Creatine Phosphate
C
Calcium ions
D
Acetylcholine
18) Contractures are a result of a total lack of
A
creatine phosphate
B
acetylcholine
C
ATP
D
Calcium
19) The situation in which contractions become stronger due to stimulation before complete relaxation occurs.
A
Maximal Stimulus
B
Threshold stimulus
C
Tetanus
D
Wave Summation
20) Only ____________ muscle cells are always multinucleated
A
smooth
B
cardiac
C
none of these
D
skeletal
*select an answer for all questions
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