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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 D

Explanation

A. Kinetic: Kinetic energy is the energy of motion, such as moving muscles or flowing blood, and is not stored energy.

B. Effective: “Effective energy” is not a standard classification in physics or biology; it does not specifically describe stored energy.

C. Energy: Energy is a general term and does not differentiate between stored and active forms.

D. Potential: Potential energy is stored energy that has the capacity to do work in the future, such as chemical energy in bonds, a stretched spring, or gravitational energy in elevated objects.

Correct Answer is B

Explanation

A. Complex tissue: While tissues are made up of similar cells working together, a complex tissue is not composed of multiple tissue types and therefore does not perform the broader functions of an organ.

B. Organ: An organ is composed of two or more tissue types that work together to perform specific functions, such as the heart pumping blood or the liver detoxifying substances. This combination of tissues allows organs to carry out specialized physiological tasks.

C. Complex cell: Cells are the basic structural and functional units of life, but a single cell, no matter how complex, does not consist of multiple tissue types.

D. Organ system: An organ system is a higher-level organization consisting of multiple organs that coordinate to perform broad physiological functions, rather than being a single structure composed of multiple tissue types.

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