1_The_Integumentary_System.pptx

What is the largest organ in the human body?  Lesson 1 The Integumentary System  Focus Question What are the structures and functions of the integumentary system?  New Vocabulary epidermis keratin melanin dermis hair follicle sebaceous gland  Review Vocabular...

What is the largest organ in the human body?  Lesson 1 The Integumentary System  Focus Question What are the structures and functions of the integumentary system?  New Vocabulary epidermis keratin melanin dermis hair follicle sebaceous gland  Review Vocabulary integument: an enveloping layer of an organism  The Structure of the Skin Skin is a multilayered organ that covers and protects the body. The outer superficial layer of the skin is the epidermis. The outer layers of the epidermal cells contain keratin, which waterproofs and protects the cells and tissues that lie underneath. The Structure of the Skin  The Structure of the Skin The Epidermis The inner layers of the epidermis contain cells that are continually dividing by mitosis to replace cells that are lost or that die. Some cells in the inner layer of the epidermis provide protection from harmful ultraviolet radiation by making a pigment called melanin.  The Structure of the Skin The Dermis Directly beneath the epidermis is the dermis. The dermis consists of connective tissue, nerve cells, muscle fibers, sweat glands, oil glands, and hair follicles. The subcutaneous layer A layer of connective tissue that stores fat and helps the body retain heat.  The Structure of the Skin Why do skin cells respond to harmful ultraviolet radiation by making the skin darker? Sunlight induces cells to produce more melanin. Melanin absorbs the damaging UV rays and helps protect the skin cells, but it also makes the skin darker.  The Structure of the Skin Hair and Nails Both hair and nails contain keratin and develop from epithelial cells. Hair cells grow out of narrow cavities in the dermis called hair follicles. Hair follicles usually have sebaceous glands associated with them that lubricate the skin and hair. ACN E  The Structure of the Skin When sebaceous glands produce too much oil, the follicles can become blocked. Oil, dirt and bacteria can become trapped in the follicle. The trapped material can close the opening of the follicle, causing a white head, blackhead or acne.  Functions of the Integumentary System Skin serves many essential functions including: 1. Temperature regulation 2. Vitamin production 3. Protection and senses  Functions of the Integumentary Functions System of the integumentary system include: 1. Temperature regulation What happens when a person is working outside on a hot summer day? In order to regulate body temperature, the body sweats. As sweat evaporates, the body cools down.  Functions of the Integumentary System Skin serves many essential functions including: 2. Vitamin production Vitamin D Vit D increases absorption of calcium into the bloodstream and is essential for proper bone formation  Functions of the Integumentary System Skin serves many essential functions including: 3. Protection and senses Skin prevents the entry of microorganisms Melanin protects against UV rays  Damage to the Skin Skin has remarkable abilities to repair itself. Without a repair mechanism, the body would be subject to invasion by microbes through breaks in the skin. Cells deep in the epidermis divide and replace the lost or injured cells. When the injury is deep, blood vessels might be injured, resulting in bleeding. Infection: Fighting white blood cells will help get rid of any bacteria that might have entered the wound.  Interactive Activity To better understand how the integumentary system works, let’s do a quick activity: Skin Sensation Game: Feel different textures and guess what they are while blindfolded. This helps us appreciate the role of skin in sensing our environment.  Interactive Activity https:// wordwall.net/resource/76691506/copy-of-i ntegumentary-system  Quiz 1 Which tissue type is. responsible for “goose bump” formation? A A CORREC T B B C C D D  Quiz 2 Which are not found in the dermis?. A muscles C fat cellsCORREC T B sweat and oil D nerve cells glands  Quiz 3 What could be inferred from suntans?. A Tanning produces C A tan strengthens healthier skin. the elastic in the skin. B A tan might D Tanning makes indicate sun skin look younger. damage to the CORREC T skin.  Quiz 4 How does the skin regulate body. temperature? A by increasing C by producing sweat production vitamin D CORREC T B by retaining water D by regulating fat content in the epidermis  Quiz 5 When are blackheads formed?. A when sebaceous C when hair follicles glands become grow inward rather clogged CORREC than outward T B when grooves in D when there is an the epidermis excess of keratin gather dirt produced