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