Which of the following substances is the determinant of an individual's skin color?
Elastin
Hemoglobin
Melanin
Keratin
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. The minor calyx collects urine from the renal papillae (tips of the renal pyramids), but it is not the structure immediately before the ureter. It connects to the major calyx.
B. Renal pyramids are structures within the kidney that contain the renal tubules and are involved in the filtration and excretion process. However, they do not directly connect to the ureter.
C. The major calyx is a larger collecting area formed by the union of several minor calyces. It channels urine into the renal pelvis but is not directly before the ureter.
D. The renal pelvis is the funnel-shaped structure that collects urine from the major calyces and funnels it into the ureter. It is the anatomical structure immediately before the ureter, which then carries urine to the bladder.
Correct Answer is B
Explanation
A. The pulmonic valve separates the right ventricle from the pulmonary artery, controlling blood flow to the lungs, not the right atrium from the right ventricle.
B. The tricuspid valve separates the right atrium from the right ventricle, allowing blood to flow from the atrium into the ventricle before it is pumped to the lungs.
C. The aortic valve separates the left ventricle from the aorta, controlling blood flow from the heart to the body, not between the atrium and ventricle.
D. The mitral valve separates the left atrium from the left ventricle, controlling blood flow in the left side of the heart.
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