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