Soc 14 The Muscular System Flashcards
What are voluntary muscles?
Voluntary muscles are under your control, you can choose when to contract or relax them. All these muscles are attached to the skeleton via tendons. When your muscles contract movement takes place.
What are 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 systems.
What are cardiac muscles?
Only found in the wall of the heart it is a very specialised type of involuntary muscle, Cardia muscle is made up of interlaced fibres. These fibres can spread electronical signals from the brain right through the heart so that all the cells can contract forether This regulates your heart rate and means that when prise your heart keeps pumping in the right way.
Deltoid
Move the arm in all directions at the shoulder
Pectoralis major
Adduct the arm at the shoulder
Latissimus dorsi
Adduct and extend the arm at shoulder
Biceps
Flex the arm at the elbow
Triceps
Extend the arm at the elbow
External obliques
Pull the chest downward; flex and rotates the spinal column; one side contracting creates a side bend
Gluteals
Adduct and extend at the hips, pull the leg backwards
Hip flexors
Flex the hip, helps move the leg and knee up towards the body
Quadriceps
Extend the leg at knee
Hamstring
Flex the leg at the knee
Gastrocnemius
Point the toes (planter flexes the ankle), help flex the knee
Tibialis anterior
Pull the toes up towards the shin (dorsi flexion)
