Chapter 5 Lecture Quiz

What is the most abundant epidermal cell, and what is its function?

• keratinocyte - physical and mechanical protection, chemical detoxification

• melanocyte - physical and mechanical protection, chemical detoxification

• dendritic cell - immune cells that take up antigens via receptor-mediated endocytosis

• keratinocyte - immune cells that take up antigens via receptor-mediated endocytosis

• melanocyte - produce the dark skin pigment melanin

Which of these is NOT part of the integumentary system?

• epidermis

• skin appendages (sweat glands, oil glands, hair, nails)

• endodermis

• subcutaneous tissue

• dermis

When the skin is stretched beyond its limit (for example, during pregnancy, obesity, or rapid muscle growth), stretch marks result from what?

• tearing of the epidermal ridges

• tearing of the elastic fibers of the dermis

• tearing of the elastic fibers of the epidermis

• tearing of the adipose connective tissue of the hypodermis

• tearing of the collagen fibers of the dermis

Which part of a nail is the most distal?

• the free edge

• the lateral fold

• the nail plate

• the nail bed

• the root

Sebum is secreted from sebaceous glands via holocrine secretion, which is:

• when a substance is secreted directly from the producing cell to the surface of the nearby target tissue

• when a substance is secreted into the interstitial fluid to travel to the target tissue in a different area of the body via blood flow

• when a substance is secreted by exocytosis

• when a substance is secreted when cells explode after engorging from producing so much of the substance

• when a substance is secreted in short episodes over a prolonged period of time