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The skeletal and mascular systems
Reflections and Exam tips
The masculo-skeletal system
Cells are arranged into tissues, which are arranged into organs, which work together to form organ systems that make up the whole organism.
An example of a system is the masculo-skeletal system. This system is made up of the mascular system (muscles) and the skeletal system (Bones).
The skeletal system
The mascular system
Muscles work in opposing pairs. When one contracts, the other one relaxes, this is antagonistic (opposing) action. An example of an antagonistic pair are the upper arm muscles-Biceps, top ones and Triceps. Biceps are attached to the collar bone using 2 tendons (2=bi), triceps are attached with 3 tendons (3= tri).
When you raise your lower arm, biceps contract to pull on it, triceps relax.
When lowering the arm, triceps contract to pull it down, biceps relax. This shows the antagonistic action.
The skeletal system is for support.
The mascular system moves bones.
Ligaments hold bones together.
Tendons join muscles to bones.