THE MUSCULAR SYSTEM Muscle types Types of contraction Anatomy 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