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For optimal effectiveness in immobilization, a cast must immobilize:

a) Only the joints
b) Only the muscles
c) Both the joints and muscles
d) Neither the joints nor muscles

1 Answer

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Final answer:

An effective cast immobilizes both the joints and muscles to hold bones in place and ensure proper healing. It restricts movement to prevent further injury and supports the healing process by keeping affected areas stable.

Step-by-step explanation:

For optimal effectiveness in immobilization, a cast must immobilize both the joints and muscles surrounding an injury. This prevents movement at the joint, ensuring the bones are held in the correct position for healing.

Joints facilitate movement, with some like the shoulder allowing a great range of motion, and are supported by muscles that span across them. The interaction between the skeletal system, consisting of bones and joints, and the muscular system is crucial for movement. Immobilizing both joints and muscles prevents further injury and aids the healing process.

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