Question

question 46 (1 point)
the body’s first line of defense against infection is ____.
a body secretions
b healthy, uncompromised skin
c white blood cells
d antitoxins

question 47 (1 point)
an abnormal cell mass that varies in size, color, and shape is a ____.
a scale
b pustule
c tubercle
d tumor

question 48 (1 point)
the tiny grains of pigment deposited in cells that provide skin with its color are ____.
a collagen
b keratin
c protein
d melanin

Explanation:

Question 46

The body's first line of defense against infection includes physical barriers. Healthy, uncompromised skin acts as a primary physical barrier, blocking pathogens. Body secretions (like mucus) are also part but skin is the main first - line physical defense. White blood cells are part of the second - line (innate) or third - line (adaptive) immune response. Antitoxins are part of the immune response to toxins, not the first line. So the correct answer is the option related to healthy skin.

A tumor is an abnormal mass of cells. It can vary in size, color, and shape. A scale is a flaky skin lesion, a pustule is a pus - filled bump, and a tubercle is a small nodule (often in the context of tuberculosis or skin lesions with more defined characteristics). So the abnormal cell mass with varying size, color, and shape is a tumor.

Melanin is the pigment that gives skin its color. Collagen is a structural protein for skin strength, keratin is a protein in hair, nails, and skin (for protection), and protein is a broad category. The pigment grains in cells that color the skin are melanin.

Answer:

b. healthy, uncompromised skin

Question 47