Question

on average, per square inch of skin, there are
select all that apply
a about 60,000 pigment - producing cells.
b more than 1,000 nerve endings
c 20 blood vessels.
d 650 sweat glands.

Explanation:

• Option a: On average, per square inch of skin, there are about 1,500 pigment - producing cells (melanocytes), not 60,000. So, option a is incorrect.
• Option b: There are more than 1,000 nerve endings per square inch of skin. This is correct as the skin is richly innervated for sensory perception.
• Option c: There are about 20 blood vessels per square inch of skin. This is a known anatomical fact.
• Option d: There are about 650 sweat glands per square inch of skin. This is also a recognized anatomical characteristic.

Answer:

B. more than 1,000 nerve endings, C. 20 blood vessels, D. 650 sweat glands.