The Integumentary System: Anatomy and Physiology: Introduction (01:25)
Skin is the largest organ on the human body and also rejuvenates the fastest. The cutaneous membrane is the skin itself. Accessory structures include hair, nails, sudoriferous glands (sweat), and sebaceous glands (oil).
The Cutaneous Membrane (08:29)
The skin protects the body from bacteria, prevents loss of bodily fluids, regulates body temperature, provides sensory stimulus, manufactures vitamin D, excretes waste products, and stores blood and nutrients for the rest of the body. The three layers of the skin are the epidermis, dermis, and subcutaneous. New skin cells travel from the stratum basale to the stratum corneum and fill with keratin.
Accessory Structures (06:15)
Goosebumps occur when a muscle by the hair's follicle contracts out of fear or rage. Sebaceous glands secrete sebum, which travels up the hair shaft and lubricates hair and skin— sudoriferous glands secrete sweat to cool the skin. Fingernails consist of the nail body, nail root, and nail bed.
Credits: The Integumentary System: Anatomy and Physiology (00:17)
Credits: The Integumentary System: Anatomy and Physiology
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