EBK INTEG.PRIN.OF ZOOLOGY
18th Edition
ISBN: 9781260411201
Author: HICKMAN
Publisher: MCG COURSE
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Chapter 31, Problem 7RQ
Explain the origin and conduction of the excitation that leads to a heart contraction. Why is the vertebrate heart said to be myogenic? If the heart is myogenic, how do you account for alterations in rate of the heartbeat?
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Question #5:
Assume that two genes are identified that confer gametophytic facultative apomixis in soybean. The
genes show independent assortment. Recessive alleles at both loci are required for the facultative
apomixis. Facultative apomixis is triggered when the temperature at pollination is above 20 degrees C.
At temperatures below 20 degrees C, all reproduction is sexual, independent of genotype.
A facultative apomict male, capable of producing viable pollen, was crossed with a sexually
reproducing female. Assuming the parents are completely inbred, what are the predicted phenotypic
ratios (apomict: non-apomict) for the F1, F2, and DH (F1-derived) generations at each of the following
temperatures*:
a) 15°C?
b) 25°C?
*for full credit, show crosses and genotypes where appropriate. Remember to position the
female first (left side) in the cross.
Type your answer here:
a. What percentage of a drug is eliminated after 4 half-lives? Please round to the nearest percent.
b. What will happen to elimination of the drug in the previous question if the system is saturated? explain and show any math involved
If you wanted to reduce the difference between peak and trough levels that occur with repeated administration of a drug, how would you adjust the dose and dose interval without changing the plateau concentration (plateau is the average of peak and trough levels)? Select your answers for both dose and interval. Hint: It may be helpful to think about this problem using an example such as food. How would you eat if you wanted to maintain very steady hunger/satiety levels without changing your total caloric intake?
Options:
A. Dose; Increase dose
B. Dose; Decrease dose
C. Dose; Do not change dose
D. Interval; Increase the interval between doses (give the drug less frequently)
E. Interval; Decrease the interval between doses (give the drug more frequently)
F. Interval; Do not change the interval
Chapter 31 Solutions
EBK INTEG.PRIN.OF ZOOLOGY
Ch. 31 - Name the chief intracellular electrolytes and the...Ch. 31 - What is the fate of spent erythrocytes in the...Ch. 31 - Prob. 3RQCh. 31 - Two distinctly different styles of circulatory...Ch. 31 - Place the following in correct order to describe...Ch. 31 - Trace the flow of blood through a mammalian heart,...Ch. 31 - Explain the origin and conduction of the...Ch. 31 - Define the terms systole and diastole. Distinguish...Ch. 31 - Prob. 9RQCh. 31 - Prob. 10RQ
Ch. 31 - Prob. 11RQCh. 31 - Describe an advantage of a fishs gills for...Ch. 31 - Describe the tracheal system of insects. What is...Ch. 31 - Trace the route of inspired air in humans from the...Ch. 31 - Prob. 15RQCh. 31 - How does a frog ventilate its lungs? Contrast an...Ch. 31 - What is the role of carbon dioxide in the control...Ch. 31 - Prob. 18RQCh. 31 - Prob. 19RQCh. 31 - The ability of hemoglobin to bind oxygen decreases...Ch. 31 - At high altitudes, the partial pressure of oxygen...
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