Skeletal System

Musculoskeletal System- two body systems that work closely together: skeletal &

muscular

Skeletal System- humans have 206 bones

Four main functions: 1) protection - eg: skull protects brain vertebra protects

spinal cord ribs protect heart &

lungs

Skeletal System- humans have 206 bones

Four main functions:

2. blood-cell production - large, flat bones produce

blood cells

Skeletal System- humans have 206 bones

Four main functions:

3 stores minerals - stores calcium & phosphorus - keeps bones strong - if we don’t eat enough Ca & P ---> our body removes them

from bones ---> bones become weaker

Skeletal System- humans have 206 bones

Four main functions:

4 Support for Muscles - muscles need to attach to

bones for movement (tendons do the connection)

Skeletal Systemcartilage

Skeletal Systemcartilage - semi-solid, flexible tissue - tip of nose, ears made of cartilage ---> continues

to grow throughout life

Skeletal Systemcartilage - semi-solid, flexible tissue - tip of nose, ears made of cartilage ---> continues

to grow throughout life

Skeletal SystemJoints & Ligaments

joint - any place where 2 or more bones meet - immovable joints - plates of skull - movable joints

Skeletal SystemJoints & Ligaments

• 4 types

- ball & socket

Skeletal SystemJoints & Ligaments

• 4 types

- pivot

Skeletal SystemJoints & Ligaments

• 4 types

- hinge

Skeletal SystemJoints & Ligaments

• 4 types

- gliding

Skeletal SystemJoints & Ligaments

ligament - tissue that holds bones together