Tissue Types and Integumentary System
Connective Tissue (45% of you)
Function: Holds us together, gives us support, protection
Types: – Bones – Blood– Cartilage– Adipose (fat)– Ligaments & tendons– Lower levels of skin
Epithelial Tissue (3% of you)
Function: lines internal and external surfaces of the body
Types– More than you need to
know Examples: outer skin
layer, digestive track lining, lung lining, etc.
Muscle tissue (50% of you)
Function: contracts to move stuff
Types: – Skeletal– Smooth (stomach)– Cardiac (heart)
Nervous Tissue (2 % of you)
Function: send messages in the form of electrical impulses
One type: neurons
On to the integument!
Consists of: skin, hair and nails Fun facts:
– Word “integument” is from Latin, means “covering”
– Your skin weighs 8 pounds– Every minute 30,000-40,000 dead skin cells fall
off you– Your skin has a totally new surface every 30 days
Functions of the Integumentary System
1. Bad stuff out: Protection from radiation, germs, pollution
2. Good stuff in: especially water 3. Regulate temperature: sweat and shiver, science
word: thermoregulation4. Sensation: pain, heat, pressure, texture5. Messaging to other humans: blushing, odors6. Vitamin D: formed when UV hits skin cells
Anatomy of the Integumentary system
Skin’s layers
Epidermis: – 4-5 layers of epithelial tissue– Cells generated at the bottom,
pushed up– No blood– Melanin– Keratin
Dermis– Connective tissue– Forms fingerprints – Sensory receptors– Blood vessels – Produces skin’s products
Subcutaneous layer– Connective and adipose tissue– Insulates– Anchors skin
Hair, Nails, Sweat and oil
Hair and nails: – Made of keratin– Hair grows from follicle
Sweat– 2 kinds (eccrine, apocrine)– From seat glands
Oil (sebum)– Protects skins and hair– From sebaceous glands
Skin diseases
Eczema Skin cancer