Transcript Musculoskeletal System - #SCIENCEISDABEST

Musculoskeletal
System
Musculoskeletal system refers to the muscles
and skeleton of the human body.
Our muscles and skeleton work together to
protect organs, enable movement and give the
body its general shape.
The Skeletal System
The Skeletal System
• The skeleton is a group of bones and cartilage
which provide a framework for the muscle
attachment.
• The skeleton helps protect the body’s vital organs.
For example:
- the rib cage protects the lungs and heart.
- the skull protects the brain.
• Bone marrow produces our blood
cells
(illustration on the following page)
A Look at Bone Marrow
Joints
• A joint (join - t) is the
area where two bones
connect.
• A joint enables us to
bend, twist and rotate.
• Most joints are
moveable.
Four Types of Moveable Joints
Name
Function
Ball-and-Socket Enable bones to move
Joints
in all directions.
Hinge Joints
Enable bones to move
in two directions.
Pivot/Rotating
Joints
Enable side to side
rotation.
Gliding Joints
Enable flat bones to
glide over each other
Example
-hips
- shoulders
-knees
-elbows
-neck
-hands
- spine
Four Types of Moveable Joints
gliding
The Muscular System
Muscular System
• Muscles attach to the skeleton whereby:
– holding the skeleton together
– giving the body its general shape
– enabling movement
• Muscle contractions help to control body
processes such as breathing, digestion and blood
flow.
• Skeletal muscles are voluntary muscles.
Voluntary and Involuntary Muscles:
1. Voluntary: Muscle contractions are controlled.
Example: skeletal muscles (biceps and triceps)
2. Involuntary: Muscle contractions occur
automatically.
Example: cardiac (heart) muscles