THE MUSCULAR SYSTEM

Muscle typesTypes of contractionAnatomy diagram

Introduction

•Our bodies have over 600 muscles, which make up half of our body weight

•Muscles are used to eat, talk, walk etc

•Muscles burn lots of calories when they are being used and when resting

•Muscles burn even more calories when they are “in shape”

MAJOR MUSCLE TYPES

SMOOTH MUSCLE:

•Involuntary and contract automatically

•CNS adjusts contraction as required

•They do not tire easily and can stay

contracted for long periods of time

Ex. Esophagus, stomach, blood vessels

MAJOR MUSCLE TYPES

CARDIAC MUSCLE

•Specialized muscle tissue that comprises

the heart

•Involuntary

MAJOR MUSCLE TYPES

SKELETAL MUSCLES:

•Connect to bones by tendons

•Voluntary – you control them

•The engines that pull on bones – causing

joints to move

MUSCLES IN ACTION…

Muscles work through a process called contraction.

Muscle Contraction – result of filaments deep within the muscle sliding over each other

This process occurs simultaneously over entire muscle fibre – resulting in contraction

Types of Muscle Contraction

•CONCENTRIC – muscle shortens while working

•ECCENTRIC – muscle lengthens while working

•ISOMETRIC – no change in length. Force = resistance.

ANATOMY DIAGRAM

•Complete the chart and diagram