Muscles can relax, contract, and provide force to move bones and body parts. There are voluntary muscles that can be controlled and involuntary muscles that cannot be controlled, like the heart. Skeletal muscles move bones and are attached by tendons, while cardiac muscle is only found in the heart and contracts 70 times per minute. Skin is the body's largest organ consisting of three layers - epidermis, dermis and hypodermis. The dermis contains blood vessels, nerves, glands and binds skin to underlying tissue.

1. MUSCLES
and
SKIN

2. * A muscle is an organ that can relax, contract,
and provide force to move bones and body parts.

3. • Voluntary muscles are muscles that YOU control
• Involuntary muscles are muscles you cannot
control.
– The muscles in the heart and internal organs
are involuntary muscles

4. • Skeletal muscles are muscles that move bones

5. • Tendons are thick bands of tissue that attach
bones to muscles

6. • Cardiac muscle is muscle found only in the heart

7. * On average, the cardiac muscle contracts
70 times per minute every day of your life.

8. • Smooth muscle is involuntary muscle that
controls movements of internal organs

9. • Skin is the thin layer of tissue which forms the
outer covering of the body
=> The skin is the largest organ of the body.

10. • Skin is made up of three layers of tissue –
dermis, epidermis, and a fatty layer called the
hypodermis

11. • The epidermis is the outermost, thinnest layer
of skin.

12. • The dermis is the layer of cells directly under the
epidermis
The dermis is a thick
layer and it contains
blood vessels,
nerves, muscles,
oil glands
and sweat glands

13. • Below the dermis is a fatty layer called the
hypodermis
The hypodermis is made up of fat and
connective tissue which is responsible
for binding skin to the tissue beneath it.

15. • Melanin is a pigment
that protects skin and
gives it color
- melanin is produced
by cells in the epidermis

16. • Functions of the skin:
=> protection
=> sensory response (touch)
=> formation of vitamin D (from sunlight)
=> regulation of body temperature (sweat)
=> ridding the body of waste (also sweat)