1. The skin and body membranes
Anatomy chapter 6
The skin and body membranes

2. Purpose of Membranes
Covering
Line cavities
Protective sheets

3. Two types of membranes according to tissue type
epithelial-cutaneous(skin), serous(lines body cavities) and mucous(mouth,lungs)
a. Peritoneum-covers organs
b. Pleura-covers lungs
c. Pericardium-covers heart

4. 2. Connective-synovial that lines joints and secretes fluid

5. Location terms: Parietal-outside wall covering
Visceral-inner wall covering

8. Integumentary system:
Composed of cutaneous(skin), sweat and oil glands, hair and nails

9. Layers of the integumentary:
Epidermis-avascular-can shave without bleeding
Dermis-vascular-epidermis and dermis are cemented together-if heat and friction split them apart then a blister forms
Subcutaneous

10. Purpose:
Protection
Insulation
Cushions internal organs

11. Structures continued:
Meissner’s corpuscles-touch receptors with nerve endings
Collagen and elastic fibers for strength and flexibility
Phagocytes to eat bacteria that has penetrated the epidermis
Fingerprints are films of sweat left on a surface

12. Skin conditions: Redness-blushing, hypertension
Jaundice-liver disorder-excess bile in blood that is deposited in the skin
Hematomas-bruises-blood leakage and clotting
Cyanosis-bluish looking skin-decrease in oxygen-decrease in breathing rate-leads to heart failure

13. Skin coloring:
Keratinizing-skin cells become tough and hard-protein that is water repellent
Melanin-yellow, brown, black pigment that gives skin color-natural sun screen
Skin color is determined by amount and kind of melanin in the epidermis and amount of carotene from foods we eat
Pigment is released by melanocytes in the epidermis
Freckles or moles are concentrated melanin