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Integumentary System.

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Presentation on theme: "Integumentary System."— Presentation transcript:

1 Integumentary System

2 SAP2. Students will analyze the interdependence of the integumentary, skeletal, and muscular systems as these relate to the protection, support and movement of the human body.

3 a. Relate the structure of the integumentary system to its functional role in protecting the body and maintaining homeostasis. EQ: What role does the integumentary system play in protecting the body and maintaining homeostasis?

4 Cutaneous Membranes Cutaneous – (skin); only epithelial membrane that is dry

5 Integumentary System Most roles are protective
Helps maintain homeostasis Insulates body Keeps water and molecules in body Protects organs from bumps, cuts, etc.

6 Make-up of epidermis Epidermis has no blood supply (avascular)
Most cells are keratinocytes Produce keratin (tough fibers which make skin tough but pliable)

7 Stratum Basale Basement membrane of epidermis Vascularized
Constantly undergoing mitosis By the time cells reach the surface, they are dead.

8 Melanin Cells in stratum basale take in melanocytes (cells produce pigment) Melanin = body’s natural sunscreen

9 Dermis Layer directly beneath the epidermis Highly Vascularized
Connective tissue

10 Make-up of Dermis Mostly collagen and elastic fibers
Fibers bind with water and keep skin hydrated Fibers decrease with age, and skin sags

11 Deep to the Dermis Subcutaneous layer Also called hypodermis
Adipose tissue Absorbs impact from bumps, protects organs; insulation


13 Skin Cancer Melanin serves to protect cellular DNA from ultraviolet light When damage is done to DNA, cancer can occur Basal Cell carcinoma (least malignant) Squamous cell carcinoma Melanoma – darkened blotches Cancer of the melanocyte

14 Papillary Layer Upper dermal region
Protrusions into epidermis called dermal papillae Nourishes epidermis

15 Also in Papillary Layer
Meissner’s corpuscles – sensory receptors (touch) Pain receptors Papillary pattern is genetic, and forms fingerprint

16 Reticular Layer Deep to papillary layer
Contains blood vessels, sweat glands and oil glands. Phagocytes prevent bacterial intrusion

17 Sweat Glands Controlled by nervous system Two types 1) Eccrine

18 Sebaceous Glands Oil Glands Ducts usually empty into a hair follicle
Secretes sebum Sebum keeps skin moist and pliable Also produces acidic compounds that kill bacteria

19 Problems with oil glands
Clogged oil gland becomes whitehead As whitehead oxidizes, it becomes darker (blackhead) Acne – infection of oil gland Seborrhea- “cradle cap”

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