Question

13.
a student creates a model to show how the body maintains homeostasis during exercise. which components must be included to accurately represent the body’s response to water loss and temperature increase?
(1) structural proteins in the bloodstream expand to store extra water and reduce pressure.
(2) enzymes in the lungs detect heat and directly reduce breathing to slow fluid loss.
(3) dna in muscle cells is activated to signal the brain to stop sweating and conserve water.
(4) receptor proteins in cells of our sweat glands detect temperature change, triggering sweat release.

Explanation:

To solve this, we analyze each option:

• Option (1): Structural proteins in blood don't expand to store water; this is incorrect.
• Option (2): Enzymes in lungs don't detect heat or reduce breathing for fluid loss; lungs' role in gas exchange, not this.
• Option (3): DNA in muscle cells doesn't signal brain to stop sweating; sweat regulation involves receptors and feedback, not muscle DNA activation.
• Option (4): Receptor proteins in sweat gland cells detect temperature change, triggering sweat release (a homeostatic response to cool the body and manage water loss). This matches how the body maintains homeostasis during exercise (temperature increase leads to sweating, and water loss is managed via this and other mechanisms like thirst).

Answer:

(4) Receptor proteins in cells of our sweat glands detect temperature change, triggering sweat release.