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The secretion of which hormone increases the permeability of cells in the collecting ducts to water so more can be reabsorbed?

A.

Aldosterone hormone

B.

Atrial natriuretic peptide hormone

C.

Antidiuretic hormone

D.

Parathyroid hormone

Answer and Explanation

The Correct Answer is C

A. Aldosterone hormone: Aldosterone affects sodium and potassium reabsorption, increasing water retention indirectly, but it does not directly increase water permeability in the collecting ducts.

B. Atrial natriuretic peptide hormone: This hormone decreases blood volume by inhibiting sodium reabsorption, leading to more water excretion, not reabsorption.

C. Antidiuretic hormone (ADH): ADH increases the permeability of the collecting ducts to water, allowing more water to be reabsorbed into the bloodstream.

D. Parathyroid hormone: This hormone primarily regulates calcium levels, not water permeability.


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Related Questions

Correct Answer is C

Explanation

A. Expiratory reserve volume: This is included in the calculation of vital capacity (VC = TV + IRV + ERV).

B. Tidal volume: This is also included in vital capacity.

C. Residual volume: The residual volume is the air that remains in the lungs after a forced exhalation and is not part of the vital capacity.

D. Inspiratory reserve volume: This is included in the calculation of vital capacity.

Correct Answer is A

Explanation

A. Lysozyme within tears destroy bacteria.: Lysozyme is an enzyme found in tears that helps to break down the cell walls of bacteria, acting as a chemical barrier and part of the innate immune system's first line of defense.

B. Chemotaxis attracts phagocytes to the site where the pathogen invaded.: This is part of the inflammatory response, which occurs after the first line of defense has been breached; therefore, it is not considered a first line of defense action.

C. Natural killer cells are the first lymphocytes to react to infection.: While natural killer cells play an essential role in the immune response, they are part of the second line of defense and respond after pathogens have entered the body.

D. Phagocytes ingest microbes when they enter the body.: This is part of the second line of defense, as phagocytes respond to pathogens that have breached the first line of defense, which includes physical and chemical barriers.

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