Consider homeostasis in the control of body water - VCE - SSCE Biology - Question 14 - 2005 - Paper 1
Question 14
Consider homeostasis in the control of body water.
If a person becomes dehydrated, the concentration of the solutes in their body fluids increases and
A. this chang... show full transcript
Worked Solution & Example Answer:Consider homeostasis in the control of body water - VCE - SSCE Biology - Question 14 - 2005 - Paper 1
Step 1
A. this change is detected by sensor cells within the hypothalamus.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
In cases of dehydration, the concentration of solutes in the blood increases, which is detected by osmoreceptors in the hypothalamus. These specialized neurons respond to the osmotic changes, signaling the body to initiate corrective measures.
Step 2
B. as a consequence responses 1 become relevant.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The hypothalamus triggers the release of antidiuretic hormone (ADH) from the pituitary gland. This hormone plays a crucial role in regulating water balance by increasing water reabsorption in the kidneys.
Step 3
C. effectors include cells within the digestive tract.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Effectors such as the cells within the digestive tract may absorb more water to help dilute the excess solutes in the bloodstream, but the primary response is related to kidney function.
Step 4
D. as a consequence responses 2 involve a decrease in water reabsorption from nephron tubules.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
In response to dehydration, the body actually decreases water reabsorption from nephron tubules to conserve water. This is primarily mediated by the increased effect of ADH, which allows the kidneys to retain more water rather than excreting it, contrasting with the premise that reabsorption decreases.
