a) Explain with respect to specific hormones, the changes in glucose concentration in EACH of the stages A to F. Clearly identify each stage.

Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
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Chapter42: The Endocrine System
Section: Chapter Questions
Problem 8TYK
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4. The graph in Figure 4 shows changes in blood glucose concentration after a meal.
A
B
D
E F.
150
Blood glucose
concentration/
mg per 100 cm3
100
50
30
60
90
120 150 180 210
Time/minutes
played
hockey
meal
eaten
FIGURE 4
a) Explain with respect to specific hormones, the changes in glucose concentration in EACH of the
stages A to F. Clearly identify each stage.
Transcribed Image Text:4. The graph in Figure 4 shows changes in blood glucose concentration after a meal. A B D E F. 150 Blood glucose concentration/ mg per 100 cm3 100 50 30 60 90 120 150 180 210 Time/minutes played hockey meal eaten FIGURE 4 a) Explain with respect to specific hormones, the changes in glucose concentration in EACH of the stages A to F. Clearly identify each stage.
b) The diagram in Figure 5 shows the difference between negative feedback and positive feedback.
Negative feedback
Receptor
Effector
Departure
Return to
resting level
from
Resting
level
Positive feedback
Further departure
from resting level
Receptor
Effector
Departure
from
Resting
level
FIGURE 5
i) Explain why negative feedback is important in homeostasis.
ii) Explain how negative feedback enables the carotid and aortic bodies and the medulla to maintain a
constant blood carbon dioxide level.
iii) It is said that the initiation of an Action Potential is an example of positive feedback. With reference to
the process involved, state why you think this statement is accurate?
Transcribed Image Text:b) The diagram in Figure 5 shows the difference between negative feedback and positive feedback. Negative feedback Receptor Effector Departure Return to resting level from Resting level Positive feedback Further departure from resting level Receptor Effector Departure from Resting level FIGURE 5 i) Explain why negative feedback is important in homeostasis. ii) Explain how negative feedback enables the carotid and aortic bodies and the medulla to maintain a constant blood carbon dioxide level. iii) It is said that the initiation of an Action Potential is an example of positive feedback. With reference to the process involved, state why you think this statement is accurate?
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