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Which of the following substances is the determinant of an individual's skin color?

A.

Elastin

B.

Hemoglobin

C.

Melanin

D.

Keratin

Answer and Explanation

The Correct Answer is C

A. Elastin is a protein found in connective tissue that provides elasticity, allowing the skin and other tissues to return to their original shape after stretching. It does not influence skin color. 

B. Hemoglobin is the oxygen-carrying component of red blood cells. It gives the skin a reddish tint due to blood flow, but it is not the primary determinant of overall skin color. 

C. Melanin is the pigment produced by melanocytes in the skin. The type and amount of melanin determine the color of an individual's skin, with darker skin having more melanin. 

D. Keratin is a structural protein found in the skin, hair, and nails, providing strength and protection. While it contributes to the skin's texture and appearance, it does not determine skin color. 


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Related Questions

Correct Answer is A

Explanation

A. The larynx, also known as the voice box, contains the vocal cords. The vocal cords vibrate to produce sound when air passes through them, allowing for speech and other vocalizations.
B. The pharynx is the passageway that connects the mouth and nose to the larynx and esophagus. It does not contain the vocal cords.
C. The trachea is the windpipe that conducts air to and from the lungs. It does not contain the vocal cords but is located just below the larynx.
D. The epiglottis is a flap of tissue that covers the opening of the larynx during swallowing to prevent food from entering the airway. It does not contain the vocal cords

Correct Answer is D

Explanation

A. Expiratory reserve volume is the amount of air that can be exhaled forcefully after normal expiration. It does not refer to the air moved in and out during the normal respiratory cycle.

B. Residual volume is the amount of air remaining in the lungs after a forced exhalation. It cannot be exhaled and is not part of the normal respiratory cycle.

C. Vital capacity is the maximum amount of air that can be exhaled after a maximum inhalation, which includes tidal volume, expiratory reserve volume, and inspiratory reserve volume. It does not specifically refer to the air moved in and out during normal breathing.

D. Tidal volume refers to the amount of air that is moved into and out of the lungs during a normal, relaxed breath. It is the term that directly describes the air exchanged during the normal respiratory cycle.

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