Hole's Human Anatomy & Physiology (Shier), 12th Edition

Ph.I.L.S. 3.0 Quizzing 25: Ph.I.L.S. 3.0 Quizzing

Ph.I.L.S. 3.0 Quizzing

1
During single 'twitch' type contractions, the muscle contracted:
A)and returned to resting length before it contracted again.
B)but did not return to resting length before it contracted again.
C)but the amount of tension created increased.
2
You applied a series of shocks to the muscle to induce contractions. What was the time interval between shocks when single twitches were observed?
A)Greater 250 ms.
B)About 200 ms.
C)About 170 ms.
D)About 70 ms.
3
During summation, the muscle contracted:
A)and returned to resting length before it contracted again.
B)but did not return to resting length before it contracted again.
C)but the amount of tension created increased.
4
You applied a series of shocks to the muscle to induce contractions. What was the longest time interval between shocks when summation was first observed?
A)Greater 250 ms.
B)About 200 ms.
C)About 170 ms.
D)About 70 ms.
5
During incomplete tetanus, the muscle:
A)contracted and returned to resting length before it contracted again.
B)contracted so that the single contractions created more tension than seen during single twitches.
C)produced a prolonged (fused) contraction and single contractions could not be seen.
6
You applied a series of shocks to the muscle to induce contractions. What was the longest time interval between shocks when incomplete tetanus was first observed?
A)Greater 250 ms.
B)About 200 ms.
C)About 170 ms.
D)About 70 ms.
7
During complete tetanus, the muscle:
A)contracted and returned to resting length before it contracted again.
B)contracted so that the single contractions created more tension than seen during single twitches.
C)produced a prolonged (fused) contraction and single contractions could not be seen.
8
You applied a series of shocks to the muscle to induce contractions. What was the longest time interval between shocks when incomplete tetanus was first observed?
A)Greater 250 ms.
B)About 200 ms.
C)About 170 ms.
D)About 70 ms.
9
A contraction is produced by an increase in the level of calcium in the cytoplasm. Where is calcium stored when the muscle is at rest?
A)In the cytoplasm.
B)Outside the cell.
C)In the sarcomere.
D)In the sarcoplasmic reticulum.
10
Why would the rate of muscle relaxation be slower after tetanus than after a single twitch?
A)The contraction was larger, so the rate of relaxation would be slower.
B)It takes time for the large amount of calcium in the cytoplasm to be taken up by the sarcoplasmic reticulum.
C)Crossbridges are formed during relaxation.
D)There is maximum amount of overlap between the thick and thin filaments.
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