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The solution that is isotonic to our red blood cells is a

A.

5% saline solution

B.

9% saline solution

C.

0.5% saline solution

D.

0.9% saline solution

Answer and Explanation

The Correct Answer is D

A. 5% saline solution: A 5% saline solution is hypertonic compared to red blood cells. In such a solution, water would move out of the cells, causing them to shrink and undergo crenation due to osmotic imbalance.

B. 9% saline solution: A 9% saline solution is extremely hypertonic to red blood cells. Exposure to this solution would lead to rapid water loss from the cells, causing severe shrinkage and cellular damage.

C. 0.5% saline solution: A 0.5% saline solution is hypotonic relative to red blood cells. In this environment, water would move into the cells, leading to swelling and potential lysis of the cells.

D. 0.9% saline solution: A 0.9% saline solution is isotonic to red blood cells. This concentration balances the osmotic pressure, preventing net water movement in or out of the cells and maintaining normal cell shape and function.


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Related Questions

Correct Answer is A

Explanation

A. Superior: The heart is located above the stomach in the thoracic cavity, making it superior in relation to the stomach, which is in the abdominal cavity.

B. Distal: Distal refers to a position farther from the point of attachment or origin, usually in limbs, and is not appropriate for describing the heart-stomach relationship.

C. Inferior: Inferior means below another structure, which applies to the stomach relative to the heart, not the other way around.

D. Proximal: Proximal refers to a location closer to the point of attachment or origin, typically used for limbs, and does not describe the heart’s position relative to the stomach.

Correct Answer is C

Explanation

A. Forehead: The forehead corresponds to the frontal region of the head, not the mental region.

B. Neck: The neck is referred to as the cervical region and is distinct from the mental region.

C. Chin: The mental region refers specifically to the chin. A laceration in this area affects the lower front part of the face, just below the lower lip.

D. Ear: The ear is part of the auricular region, which is lateral to the mental region and unrelated to the chin.

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