Essential Functions of Human Body Systems and Coordination
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Skeletal System: Functions and Joints
Skeletal System Functions
- Support the body structure.
- Protect vital organs.
- Provide points of attachment for muscles.
- Manufacture blood cells (hematopoiesis).
- Store calcium and phosphorus.
Joints: Connections Between Bones
Joints are places where bones connect. They are classified by the degree of movement they permit:
- Fixed Joints (Synarthroses): Do not permit movement (e.g., skull sutures).
- Slightly Movable Joints (Amphiarthroses): Allow limited movement (e.g., vertebrae).
- Freely Movable Joints (Diarthroses): Allow bone movement in all directions (e.g., knee).
Sensory Receptors and Stimuli Perception
Types of Receptors
- Internal Receptors (Interoceptors): Perceive changes occurring inside the body (e.g., blood pressure,