The following diagram is a summary of a homeostatic mechanism for compound X - VCE - SSCE Biology - Question 16 - 2006 - Paper 1
Question 16
The following diagram is a summary of a homeostatic mechanism for compound X.
increase in compound X in blood → organ Y detects increase → cells in organ Y release ... show full transcript
Worked Solution & Example Answer:The following diagram is a summary of a homeostatic mechanism for compound X - VCE - SSCE Biology - Question 16 - 2006 - Paper 1
Step 1
A. the cells must act as exocrine glands.
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Answer
This statement is incorrect because exocrine glands secrete their products through ducts to external surfaces, whereas organ Y likely relies on regulating internal environments rather than secreting directly to an external location.
Step 2
B. there must be sensors for compound X levels.
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Answer
This statement is correct. In order for organ Y to detect an increase in compound X, there must be specific sensors that can measure the levels of compound X in the blood.
Step 3
C. compound Z must act to increase blood levels of compound X.
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Answer
This statement is incorrect since compound Z is released in response to elevated levels of compound X, and its role is likely to decrease the levels of compound Z rather than increase compound X.
Step 4
D. compound X sensors and compound X effectors are part of the nervous system.
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Answer
This statement is incorrect. While the nervous system can play a role in homeostasis, the sensors for compound X are likely specific receptors in organ Y, not necessarily part of the nervous system.
