Lesson Overview Skin The Integumentary System Lesson Overview

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Lesson Overview Skin - The Integumentary System Lesson Overview 32. 3 Skin – The

Lesson Overview Skin - The Integumentary System Lesson Overview 32. 3 Skin – The Integumentary System

Lesson Overview Skin - The Integumentary System THINK ABOUT IT What’s the largest organ

Lesson Overview Skin - The Integumentary System THINK ABOUT IT What’s the largest organ in your body? By far the largest human organ is the skin. The skin has a lot of roles that go beyond just covering your body.

Lesson Overview Skin - The Integumentary System Functions • • • Protection from infection

Lesson Overview Skin - The Integumentary System Functions • • • Protection from infection and injury Regulates body temperature Removes wastes from the body Gathers information Produces vitamin D

Lesson Overview Skin - The Integumentary System Protection Skin • forms a barrier that

Lesson Overview Skin - The Integumentary System Protection Skin • forms a barrier that blocks out pathogens and debris • prevents the body from drying out • provides protection from the sun’s ultraviolet radiation Nails protect the tips of fingers and toes

Lesson Overview Skin - The Integumentary System Body Temperature Regulation Skin releases excess heat

Lesson Overview Skin - The Integumentary System Body Temperature Regulation Skin releases excess heat generated by working cells, while keeping in enough heat to maintain normal body temperature. Hair helps to prevent heat loss from the head.

Lesson Overview Skin - The Integumentary System Excretion A small amount of sweat is

Lesson Overview Skin - The Integumentary System Excretion A small amount of sweat is constantly released from your sweat glands. Sweat contains waste products such as urea and salts.

Lesson Overview Skin - The Integumentary System Information Gathering The skin senses pressure, heat,

Lesson Overview Skin - The Integumentary System Information Gathering The skin senses pressure, heat, cold, and pain in the outside environment and transmits that information to the nervous system.

Lesson Overview Skin - The Integumentary System Vitamin D Production Sunlight is needed to

Lesson Overview Skin - The Integumentary System Vitamin D Production Sunlight is needed to produce vitamin D in skin cells. Vitamin D is needed to absorb calcium and phosphorus from the small intestine.

Lesson Overview Skin - The Integumentary System Structures What makes up the integumentary system?

Lesson Overview Skin - The Integumentary System Structures What makes up the integumentary system?

Lesson Overview Skin - The Integumentary System Structures • • Skin Hair Nails Glands

Lesson Overview Skin - The Integumentary System Structures • • Skin Hair Nails Glands

Lesson Overview Skin - The Integumentary System Layers of the skin • Epidermis •

Lesson Overview Skin - The Integumentary System Layers of the skin • Epidermis • Dermis • Hypodermis

Lesson Overview Skin - The Integumentary System Epidermis is the outer layer of the

Lesson Overview Skin - The Integumentary System Epidermis is the outer layer of the skin • the outer layer of the epidermis is made up of dead cells • the inner layer is made up of living cells that produce new skin

Lesson Overview Skin - The Integumentary System Epidermis As new cells are produced in

Lesson Overview Skin - The Integumentary System Epidermis As new cells are produced in the inner layer, they push older cells to the surface. The older cells flatten and they make keratin, a tough, fibrous protein. Eventually, the older cells die and form a tough, flexible, waterproof covering on the surface of the skin that is shed every four to five weeks.

Lesson Overview Skin - The Integumentary System Epidermis The epidermis contains cells that produce

Lesson Overview Skin - The Integumentary System Epidermis The epidermis contains cells that produce a dark brown pigment called melanin. Melanin helps protect the skin by absorbing ultraviolet rays from the sun. People with darker skin produce more melanin than people with lighter skin.

Lesson Overview Skin - The Integumentary System Dermis • Layer below the epidermis •

Lesson Overview Skin - The Integumentary System Dermis • Layer below the epidermis • Contains the protein collagen, blood vessels, nerve endings, glands, sensory receptors, smooth muscles, and hair follicles

Lesson Overview Skin - The Integumentary System Dermis Structures in the dermis help to

Lesson Overview Skin - The Integumentary System Dermis Structures in the dermis help to regulate body temperature. • Blood vessels narrow to prevent heat from escaping through the skin in cold temperatures • Blood vessels get wider to release heat on hot days

Lesson Overview Skin - The Integumentary System Dermis Excess heat is also released when

Lesson Overview Skin - The Integumentary System Dermis Excess heat is also released when sweat glands produce perspiration (sweat). When sweat evaporates, it takes heat away from your body.

Lesson Overview Skin - The Integumentary System Dermis The skin also contains sebaceous glands,

Lesson Overview Skin - The Integumentary System Dermis The skin also contains sebaceous glands, which secrete an oily substance called sebum that is released at the surface of the skin.

Lesson Overview Skin - The Integumentary System Hypodermis • Layer beneath the dermis •

Lesson Overview Skin - The Integumentary System Hypodermis • Layer beneath the dermis • Composed of fat and loose connective tissue that insulates the body

Lesson Overview Skin - The Integumentary System Hair • Composed of keratin • Hair

Lesson Overview Skin - The Integumentary System Hair • Composed of keratin • Hair on the head protects the scalp from the sun and provides insulation from the cold • Hairs in the nostrils and ears, and eyelashes prevent dirt and other particles from entering the body

Lesson Overview Skin - The Integumentary System Hair is produced by cells at the

Lesson Overview Skin - The Integumentary System Hair is produced by cells at the base of hair follicles

Lesson Overview Skin - The Integumentary System Hair Sebaceous glands produce an oily substance

Lesson Overview Skin - The Integumentary System Hair Sebaceous glands produce an oily substance that helps hairs stay soft and flexible.

Lesson Overview Skin - The Integumentary System Nails • • Composed of keratin protein

Lesson Overview Skin - The Integumentary System Nails • • Composed of keratin protein Protects the tips of the fingers and toes Grow at an average rate of 3 mm per month Fingernails grow about four times faster than toenails

Lesson Overview Skin - The Integumentary System Skin Problems What are some problems that

Lesson Overview Skin - The Integumentary System Skin Problems What are some problems that affect the skin?

Lesson Overview Skin - The Integumentary System Acne develops when sebum and dead skin

Lesson Overview Skin - The Integumentary System Acne develops when sebum and dead skin cells form plugs in hair follicles. Bacteria are often trapped in the plug, which leads to infection and inflammation. High hormone levels during puberty lead to increased sebum production.

Lesson Overview Skin - The Integumentary System Hives Allergic reactions to food or medicine

Lesson Overview Skin - The Integumentary System Hives Allergic reactions to food or medicine can cause red welts called hives. During an allergic reaction small blood vessels widen. Fluid can ooze from the vessels into surrounding tissues which causes the swelling that leads to hives.

Lesson Overview Skin - The Integumentary System Skin Cancer • Due to abnormal growth

Lesson Overview Skin - The Integumentary System Skin Cancer • Due to abnormal growth of cells in the skin • Caused by exposure to the ultraviolet radiation in sunlight and artificial radiation from tanning beds Examples of the three most common types of skin cancer (basal cell, squamous cell, and melanoma) are shown.

Lesson Overview Skin - The Integumentary System Skin Cancer Prevention • wear a hat,

Lesson Overview Skin - The Integumentary System Skin Cancer Prevention • wear a hat, sunglasses, and protective clothing • wear sunscreen that has an SPF of at least 15