Soc14: Muscular System Flashcards
Voluntary muscles
Are under your control, you can choose when to contract or relax them.
Involuntary muscles
Involuntary muscles are not under our control, They contract and relax automatically controlled by the involuntary nervous system. They can be found in the digestive organs, circulatory and urinary system.
Cardiac muscles
Cardiac muscle is only found in the wall of the heart and is a specialised type of involuntary muscle. Cardiac muscle is made up of intelaced fibres. These fibres can spread electronical signals from the brain right through the heart so that all the cells can contract together. This regulates your heart rate and means that when you exercise your heart keeps pumping in the right way
The voluntary muscular system
The term ‘muscular system’ describes all the muscles in the body and the way they work together. Working with the skeletal system, muscles contract and relax to produce movement. Muscles also define your body shape and help you to maintain your posture whether sitting or standing.
Of course crucial when exercising or
he sport. You can train them to be stronger, work for
out tiring and be more flexible.
Deltoid
Move the arm in all directions at the shoulder
Pectoralis major
Adduct the arm at the shoulder
What movement does Latissimus dorsi allow
Adduct and extend the arm at the shoulder
Biceps
Flex the arm at the elbow
Triceps
Extend the arm at the elbow
External obliques
Pull the chest downwards; flex and rotate the spinal column; one side contracting creates a side bend
Gluteals
Adduct and extend leg out the hips, pull the leg backwards
Hip flexors
Flex the hip, help move the leg and knee up towards the body
Quadriceps
Extend the leg at the knee
Hamstrings
Flex at the leg at the knee
Gastrocnemius
Point the toes (plantar-flexes the ankle), help flex the knee
