University:
Glendale Community College
Course:
BIO160 | Introduction to Human Anatomy and Physiology
Academic year:

2020
Views:

242

Pages:

2
Author:

Abram Pham

Functions of the Skin • Skin is a barrier to microbes, chemical irritants, water loss. • Vitamin D synthesis begins in skin exposed to UV light. Vitamin D helps calcium absorption from intestines. • Sensory functions of skin include receptors for heat, cold, touch, itch, pressure and pain • Thermoregulation by skin is accomplished through regulatory centers in the hypothalamus of the brain that regulates blood flow through the skin and controls secretions of sweat glands to conserve or dissipate heat. • Psychological and social functions of skin: – the appearance and smell of skin can have a significant psychological impact Overview of the Skin as an Organ • Skin is the largest organ of the body (15% of body weight). • Skin is composed of two distinct tissues: Epidermis and Dermis – hair, nails and skin glands are modified epidermal structures • Hypodermis is fatty connective tissue under the skin. • Skin thickness varies 1-6 mm depending on location and use. – Thin Skin (1-2 mm) covers most of the body and has hair follicles, sweat glands and oil glands. – Thick Skin (up to 6 mm) is much thicker and has no hair follicles. • found on palms of hands and soles of feet • can be thickened by repeated pressure or friction (calluses or corns)