SMS Notes 7th Grade Science

SKELETAL SYSTEM

Function of the Skeletal System Skeleton or Skeletal System- a network of 206 bones

Function of the Skeletal System Purpose Shape and Support Enables you to move Produces blood cells Provides attachment surfaces for muscle Protects internal organs

Joints Joints- area where two or more bones meet Examples: knees, hips, elbows, and skull

Tendons Tendons are bone to muscle and ligaments are bone to bone.

Skeletal System

Skeletal System

THE MUSCULAR SYSTEM

The Muscular System Muscle Action Involuntary muscles move without us thinking about it (swallow, breath, blink, heartbeat) Voluntary muscles we are in full control of (arms, legs, skeletal system)

The Muscular System Types of Muscle Skeletal-voluntary, moves the skeletal system Smooth-involuntary, found in digestive system and in blood vessels Cardiac- involuntary, found only in heart

The Muscular System Muscles at Work Because muscles only contract, there must be a muscle on both sides of a joint to make them work. These muscles are called antagonistic muscles. One will flex and one will extend a joint. The bicep is an antagonistic muscle to the tricep.

Muscular System

Integumentary System (SKIN)

Integumentary System The Body’s Tough Covering The skin covers the body and prevents the loss of water. It protects the body from injury and infection. The skin also helps to regulate body temperature, eliminate waste, gather information about the environment, and produce vitamin D.

Integumentary System Epidermis Outermost layer of skin Thinner than dermis No nerves or blood vessels Dead cells on outer surface and newer cells underneath Contains melanin that protects skin from burning

Integumentary System The Dermis Contain nerves, sweat glands, hairs, pores, oil glands, and blood vessels

Integumentary System Caring for your skin: Eat properly Drink water Limit sun exposure to protect from cancer Keep skin clean to avoid acne

Integumentary System

Integumentary System