Anatomy: Integumentary System

What is the outermost, avascular layer of the skin called?

The epidermis.

Which gland is responsible for secreting an oily substance to lubricate the skin and hair?

Sebaceous gland.

What is the primary structural protein found in the hair, nails, and epidermis?

Keratin.

Which layer of the epidermis is the site of active cell division (mitosis)?

Stratum basale.

What is the primary function of Langerhans cells within the epidermis?

They act as antigen-presenting cells for the immune system.

Which specific layer of the dermis is composed of loose areolar connective tissue and forms dermal papillae?

The papillary layer.

How do eccrine sweat glands differ from apocrine sweat glands in terms of primary function?

Eccrine glands are primarily for thermoregulation, while apocrine glands are associated with scent and emotional stress.

What is the physiological purpose of melanin production by melanocytes?

To protect the nuclei of keratinocytes from ultraviolet (UV) radiation damage.

In which specific areas of the body would you find the stratum lucidum?

In thick skin, specifically the palms of the hands and soles of the feet.

List the four sequential stages of cutaneous wound healing.

Hemostasis, Inflammation, Proliferation, and Remodeling (Maturation).