Soc 14 The Muscular System Flashcards
Voluntary muscles
You choose when to contract or relax them. All those muscles are attached to the skeleton via tendons. When contracted movement takes place
Involuntary muscles
Are not under our control. They contract and relax automatically by the involuntary nervous system. They can be found in digestive organs, circulatory and urinary systems
Cardiac muscle
Only found in wall of the heart and is made uo if interfaced fibres. The fibres can spread electronical signlas from the brain right through to he heart so that all the cells can contract together. This regulates your heart rate and means when you exercise your heart keeps pumping the right way
The voluntary muscle system
The muscles in the body and the way they work together. Working with the skeletal system muscles contract and relax to rpoduce movement
Deltoid
Move the arm in all directions at the shoulder. Eg. Serving in tennis
Pectoralis major
Adduct the arm at the shoulder. Eg, forehand drive in tennis
Latissimus dorsi
Adduct and extend the arm at the shoulder. Eg. Butterfly stroke in swimming
Biceps
Flex arm at the elbow. Eg. Drawing a bow in archery
Triceps
Extend the arm at the elbow. Eg. Throwing a javelin
External obliques
Pull the chest downward, flex and rotate the spinal column, one side contracting creates a side bend. Eg. Crunches in the gym
Gluteals
Adduct and extend the leg at the hips, pull the leg backwards. Eg. Pulling back leg before kicking a ball
Hip flexors
Flex the hip, help move the leg and knee up towards the body. Eg. Lifting knees high in sprinting
Quadriceps
Extned hte leg at the knee. Eg. Kicking ball
Hamstrings
Flex the leg at the knee. Eg. Bending knee before kicking ball
Gastrocnemius
Points the topes. Eg. Running
