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Integumentary system pt_1

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ShaMiyahDavis

The integumentary system includes the skin, hair, and nails. The skin is composed of three layers - the epidermis, dermis, and hypodermis. The epidermis contains keratinized cells that waterproof the skin. The dermis contains connective tissue, blood vessels, and sensory receptors. The hypodermis is made of fat and connective tissue. The five main functions of skin are protection, regulation of water loss, production of vitamin D, gathering of sensory information, and regulation of body temperature through mechanisms like sweating and shivering.

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Integumentary SystemIntegumentary System Unit 3: Integumentary System A&P Chapter 5
Learning GoalsLearning Goals Copy at TOP of page 43 1) Describe the 3 layers of the skin including the location and what structures are found in each. 2) Explain the 5 functions of the skin including how each relates to homeostasis.
1. Integumentary System1. Integumentary System The Integumentary system includes: Skin largest organ of the body Accessory Organs: Hair Nails Serves to protect the viscera (internal organs) and regulate temperature
11. Structure of the Skin11. Structure of the Skin The skin is composed of 3 layers from superficial to deep:
1. Epidermis1. Epidermis Outermost layer of skin Stratum Corneum hard outermost layer of epidermis Produces a protein called keratin Keratinization causes hardening of dead skin cells, making skin waterproof. Stratum Basale produces new cells of epidermis Contains Langerhans cells (for immunity) and melanocytes (make pigment to give skin color)
2. Dermis2. Dermis Thick layer of connective tissue containing: Dermal papillae ridges that cause fingerprints and provide gripping surface Collagen & elastic fibers stretching & movement Blood vessels Sensory Nerves Sebaceous Glands Hair Follicles
3. Hypodermis3. Hypodermis (Subcutaneous Layer)(Subcutaneous Layer) Deepest layer of skin Composed of loose connective tissue and adipose tissue (fat) Helps to store energy, insulate body, and provides protective padding
IV. Five Functions of the SkinIV. Five Functions of the Skin 1. Protection Physical barrier to disease, dirt, and UV radiation Bacteria and other invaders are prevented entry by the top dead layer of skin and the acidic, oily secretion from sebaceous glands (sebum).
2. Regulates Water Loss2. Regulates Water Loss Keratinization of the dead skin outer layer also prevents water from entering or leaving the skin, even when immersed in water. Skin works with the urinary system to sweat off some excess water.
3. Produces Vitamin D3. Produces Vitamin D Melanocytes produce melanin to protect against harmful UV radiation from the sun and also to produce Vitamin D Vitamin D helps regulate the uptake of calcium by the digestive system. Calcium is needed for strong bones.
4. Gathers Sensory Information4. Gathers Sensory Information Sensory receptors are linked to the nervous system Receptors specialize in sensing Touch Pressure Pain Temperature (hot & cold) Many receptors in hands
Integumentary system pt_1
5. Regulates Body Temperature5. Regulates Body Temperature When the body is too hot, the skin will help to release heat to cool the body temperature back to 98.6属: Sweat Dilation of dermal blood vessels
When the body is too cold, the skin will help to raise body temperature back to 98.6属 by generating heat: Shivering (muscle contraction) Goosebumps (contraction of arector pili muscles attached to hair follicles) cause hair to trap heat Constriction of dermal blood vessels
Bad things happen when body temp. is not constant: 1. Hypothermia -Lower body temp. than normal interferes with the bodys normal functions and eventually ends in death
`` 2. HyperthermiaHigher body temp. than normal results in dehydration (from excess sweating) and heat stroke.

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Integumentary system pt_1

  • 1. Integumentary SystemIntegumentary System Unit 3: Integumentary System A&P Chapter 5
  • 2. Learning GoalsLearning Goals Copy at TOP of page 43 1) Describe the 3 layers of the skin including the location and what structures are found in each. 2) Explain the 5 functions of the skin including how each relates to homeostasis.
  • 3. 1. Integumentary System1. Integumentary System The Integumentary system includes: Skin largest organ of the body Accessory Organs: Hair Nails Serves to protect the viscera (internal organs) and regulate temperature
  • 4. 11. Structure of the Skin11. Structure of the Skin The skin is composed of 3 layers from superficial to deep:
  • 5. 1. Epidermis1. Epidermis Outermost layer of skin Stratum Corneum hard outermost layer of epidermis Produces a protein called keratin Keratinization causes hardening of dead skin cells, making skin waterproof. Stratum Basale produces new cells of epidermis Contains Langerhans cells (for immunity) and melanocytes (make pigment to give skin color)
  • 6. 2. Dermis2. Dermis Thick layer of connective tissue containing: Dermal papillae ridges that cause fingerprints and provide gripping surface Collagen & elastic fibers stretching & movement Blood vessels Sensory Nerves Sebaceous Glands Hair Follicles
  • 7. 3. Hypodermis3. Hypodermis (Subcutaneous Layer)(Subcutaneous Layer) Deepest layer of skin Composed of loose connective tissue and adipose tissue (fat) Helps to store energy, insulate body, and provides protective padding
  • 8. IV. Five Functions of the SkinIV. Five Functions of the Skin 1. Protection Physical barrier to disease, dirt, and UV radiation Bacteria and other invaders are prevented entry by the top dead layer of skin and the acidic, oily secretion from sebaceous glands (sebum).
  • 9. 2. Regulates Water Loss2. Regulates Water Loss Keratinization of the dead skin outer layer also prevents water from entering or leaving the skin, even when immersed in water. Skin works with the urinary system to sweat off some excess water.
  • 10. 3. Produces Vitamin D3. Produces Vitamin D Melanocytes produce melanin to protect against harmful UV radiation from the sun and also to produce Vitamin D Vitamin D helps regulate the uptake of calcium by the digestive system. Calcium is needed for strong bones.
  • 11. 4. Gathers Sensory Information4. Gathers Sensory Information Sensory receptors are linked to the nervous system Receptors specialize in sensing Touch Pressure Pain Temperature (hot & cold) Many receptors in hands
  • 13. 5. Regulates Body Temperature5. Regulates Body Temperature When the body is too hot, the skin will help to release heat to cool the body temperature back to 98.6属: Sweat Dilation of dermal blood vessels
  • 14. When the body is too cold, the skin will help to raise body temperature back to 98.6属 by generating heat: Shivering (muscle contraction) Goosebumps (contraction of arector pili muscles attached to hair follicles) cause hair to trap heat Constriction of dermal blood vessels
  • 15. Bad things happen when body temp. is not constant: 1. Hypothermia -Lower body temp. than normal interferes with the bodys normal functions and eventually ends in death
  • 16. `` 2. HyperthermiaHigher body temp. than normal results in dehydration (from excess sweating) and heat stroke.