Pranavi Kanderi 7th grade period 4
Five of the system's functions.
- Cover- Protects from germs, dehydration, and injury. It's the first line of defense.
- Epidermis- Epithelial cells with no blood. It is avascular.
- Dermis- True skin made of connective tissue. It is vascular.
- Hypodermis- it's also know as subcutaneous. Attaches integument to muscle.
- Sweat Glands- Sweat glands cool and protect.
Epidermis and Dermis
Epidermis is the layer on top. It even has layers. The very top layer is dead skin cells called Stratum corneum. Stratum corneum protects you and is slightly acidic.
The very bottom layer
of the epidermis produces more
cells by undergoing continuous cell
division. It's called Stratum Germinativum.
Dermis is below the epidermis and is a more thicker, inner layer of skin. It has matted masses of:
- Connective tissue.
- Elastic fibers.
- Nerve endings.
- Hair follicles.
- Oil and sweat glands.
Acne is a common and chronic disorder of the sebaceous glands. Fine hair follicles become plugged with sebum, and a mixture of oil and cells allow bacteria to grow in the plugged follicles. Then bacteria produce chemicals and enzymes and attract white blood cells that cause inflammation. Treatments include vitamin A products salicylic acid,benzoyl peroxide and antibiotics.
Athletes foot is a fungal infection that can grow and multiply on human skin, especially the feet. It grows best in a dark, moist and warm environment. A foot inside a shoe is an excellent place for the fungus. Most cases can be treated with anti fungal medications at home, but go to a dermatologist.
Dermatitis is characterized by redness,scaling,itching, and swelling. It is caused by an allergic substance that makes direct contact with the skin. Cream,ointment,lotions, and bandages will help stop the itching.