MUSCLES Year 10 AADP

Muscles of the body Trapezius Pectoral Deltoid Latissimus Dorsi Bicep Tricep Wrist Flexors Abdominals Wrist extensors Gluteus Maximus Quadriceps Hamstring Tibialis Anterior Gastrocnemius Soleus

Muscles of the body

Types of Muscle Muscles can be described as either: Voluntary (you have control), biceps, triceps etc. Or Involuntary (we have no direct control), heart, brain, organs.

3 main types of muscle

Smooth Muscle Smooth muscle is usually an internal involuntary muscle. It is made up of spindle shaped cells. E.g blood vessels, intestinal walls, internal organs.

Example

Cardiac Muscle Cardiac muscle is only found in the wall of the heart. It is an involuntary muscle. Its branched fibres give it a stripped appearance.

Example

Skeletal Muscle These are external, voluntary muscles. Such as the deltoid, quadriceps and biceps. Made up of lots of long fibres grouped together.

Example

Features of all muscles Are controlled by nerves. Will waste away (atrophy) if not enough blood supplied to them. Will enlarge (hypertrophy) in response to increased work

Feature of all muscles Will return to their original size and shape after being stretched or contracted. All muscles are fed from the blood by capillaries that penetrate all the fibres