Suggest two situations which may result in a drop in the water content of the blood - Leaving Cert Biology - Question c - 2008
Question c
Suggest two situations which may result in a drop in the water content of the blood.
When the water content of the blood drops a hormone is released. Name this horm... show full transcript
Worked Solution & Example Answer:Suggest two situations which may result in a drop in the water content of the blood - Leaving Cert Biology - Question c - 2008
Step 1
Suggest two situations which may result in a drop in the water content of the blood.
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Answer
Two situations that may cause a decrease in blood water content include:
Hot conditions or excessive sweating - This leads to increased fluid loss through perspiration.
High salt intake - Consuming a diet rich in salt can cause the body to lose water as it attempts to balance the salt concentration.
Step 2
When the water content of the blood drops a hormone is released. Name this hormone and the endocrine gland from which it is secreted.
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Answer
Antidiuretic hormone (ADH), also known as vasopressin, is the hormone released. It is secreted by the pituitary gland.
Step 3
Give a precise target area for this hormone.
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The target area for ADH is the distal tubule or collecting duct in the kidneys.
Step 4
How does the hormone reach the target area?
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Answer
ADH is released into the bloodstream where it travels to the kidneys, specifically targeting the distal tubule and collecting duct.
Step 5
Explain the role of the hormone at its target area, when the water content of the blood is low.
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At its target area, ADH makes the walls of the tubules more permeable to water. This increased permeability allows for more water to be reabsorbed back into the bloodstream, thereby helping to correct the low water content of the blood. Consequently, this leads to more concentrated urine and helps conserve bodily fluids.
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