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Chapter 26 Quiz
Return to Animal Physiology 4e Student Resources
Chapter 26 Quiz
Quiz Content
*
not completed
.
Dives by Weddell seals are mostly
short and shallow.
correct
incorrect
long and deep.
correct
incorrect
short and deep.
correct
incorrect
long and shallow.
correct
incorrect
*
not completed
.
The deepest dives of Weddell seals are at a depth of about _______ m.
300
correct
incorrect
600
correct
incorrect
900
correct
incorrect
1,500
correct
incorrect
*
not completed
.
Which animal is the deepest diver?
Weddell seal
correct
incorrect
Fur seal
correct
incorrect
Elephant seal
correct
incorrect
Crabeater seal
correct
incorrect
*
not completed
.
An animal's maximum possible blood store of O
2
is calculated by
multiplying the oxygen-carrying capacity of the blood by blood volume and then dividing by oxygen solubility.
correct
incorrect
dividing the oxygen-carrying capacity of the blood by blood volume.
correct
incorrect
multiplying the oxygen-carrying capacity of the blood by blood volume.
correct
incorrect
multiplying the oxygen-carrying capacity of the blood by blood volume and multiplying that product by animal mass.
correct
incorrect
*
not completed
.
One the most consistent features of diving species of mammals is that, relative to terrestrial species, they have
very high myoglobin concentration in their skeletal muscle.
correct
incorrect
very high myoglobin concentrations in their visceral organs.
correct
incorrect
very high hemoglobin concentrations.
correct
incorrect
high blood volumes.
correct
incorrect
*
not completed
.
In diving mammals, the thorax
is rigid in order to prevent compression during dives.
correct
incorrect
can be either rigid or compressible during dives, depending on the species.
correct
incorrect
only compresses at depths beyond 1500 m.
correct
incorrect
is freely compressible during dives.
correct
incorrect
*
not completed
.
Which oxygen store (per kg) is significantly larger in true (phocid) seals, such as the Weddell seal, compared to a human?
O
2
bound to myoglobin
correct
incorrect
O
2
bound to hemoglobin
correct
incorrect
O
2
in the lungs
correct
incorrect
O
2
bound to myoglobin and O
2
bound to hemoglobin
correct
incorrect
*
not completed
.
Which oxygen storage compartment tends to be the largest in diving mammals?
Lungs
correct
incorrect
Myoglobin
correct
incorrect
Blood
correct
incorrect
Interstitial fluids
correct
incorrect
*
not completed
.
The predicted dive time of a Weddell seal based on calculations of its oxygen stores is likely to be _______ the actual maximal dive times measured in the field.
shorter than
correct
incorrect
longer than
correct
incorrect
about the same length as
correct
incorrect
exactly half
correct
incorrect
*
not completed
.
Which statement regarding circulation and diving is
false
?
Regional vasoconstriction occurs during a forced dive.
correct
incorrect
During an episode of regional vasoconstriction, flow to parts of the brain is cut off or severely restricted.
correct
incorrect
Regional vasoconstriction occurs during a prolonged dive.
correct
incorrect
During an episode of regional vasoconstriction, flow to parts of the body posterior to the heart is cut off or severely restricted.
correct
incorrect
*
not completed
.
Because of a regional vasoconstriction during a prolonged dive, the heart responds with a reduction in
pressure.
correct
incorrect
cardiac output.
correct
incorrect
heart rate.
correct
incorrect
cardiac output and heart rate.
correct
incorrect
*
not completed
.
In freely diving marine mammals, heart rate
does not change with dive duration.
correct
incorrect
increases in a graded manner with dive duration.
correct
incorrect
decreases immediately after a dive and then becomes independent of dive duration.
correct
incorrect
decreases in a graded manner with dive duration.
correct
incorrect
*
not completed
.
Fish removed from water are likely to exhibit
slight bradycardia.
correct
incorrect
profound bradycardia.
correct
incorrect
slight tachycardia.
correct
incorrect
profound tachycardia.
correct
incorrect
*
not completed
.
During forced submergence, harbor seals deplete O
2
in their _______, while O
2
levels in their _______ remain high.
lungs; blood
correct
incorrect
blood; muscles
correct
incorrect
muscles; blood
correct
incorrect
lungs; muscles
correct
incorrect
*
not completed
.
Following a 45-minute dive by a Weddell seal, circulating levels of lactic acid would likely fall to pre-dive levels after about
20 minutes.
correct
incorrect
70 minutes.
correct
incorrect
2 hours.
correct
incorrect
4 hours.
correct
incorrect
*
not completed
.
Metabolic limits on dive duration are determined by all of the following
except
O
2
stores.
correct
incorrect
rates of O
2
use.
correct
incorrect
lactic acid production.
correct
incorrect
lactic acid clearance.
correct
incorrect
*
not completed
.
During a voluntary dive, a Weddell seal's metabolic rate is _______ that of a resting seal on land.
higher than
correct
incorrect
lower than
correct
incorrect
similar to
correct
incorrect
extremely variable compared to
correct
incorrect
*
not completed
.
During a dive, blood pH tends to _______ due to an increase in _______.
increase; lactic acid
correct
incorrect
increase; CO
2
and lactic acid
correct
incorrect
decrease; CO
2
and lactic acid
correct
incorrect
decrease; lactic acid
correct
incorrect
*
not completed
.
The longest dive that can be undertaken without a net accumulation of lactic acid above resting level is called the
aerobic dive limit.
correct
incorrect
anaerobic threshold.
correct
incorrect
anaerobic diving limit.
correct
incorrect
aerobic dive scope.
correct
incorrect
*
not completed
.
What is the primary cause of decompression sickness?
An imbalance of CO
2
caused by
surfacing too quickly
correct
incorrect
Distention of lung tissue from rapid loss of pressure
correct
incorrect
Formation of O
2
bubbles in the blood
correct
incorrect
Formation of N
2
bubbles in the blood
correct
incorrect
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