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The Blood › View

The blood is made up of 90% red blood cells.

A. TRUE

B. FALSE

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Musculoskeletal System › View

Which of the following describes how muscles and bones work together to create movement?

A. Muscles are attached to bones by tendons. When a muscle contracts, it pulls on the bone, causing bending at a joint. To reverse the action at the joint, contraction of an opposing group of muscles occurs.

B. Muscles are attached to bones by ligaments. When a muscle contracts, it pulls on the bone, causing bending at a joint. To reverse the action at the joint, contraction of an opposing group of muscles occurs.

C. Muscles are attached to bones by tendons. When a muscle contracts, it pulls on the bone, causing bending at a joint. To reverse the action at the joint, the same muscle group extends, causing movement in the opposite direction.

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