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The four movable joints in the body are the hinge joint, pivot joint, ball and socket joint, and gliding joint. Hinge joints, like the elbow and knee, allow movement in one direction. Pivot joints, such as the joints between the radius and ulna in the forearm, allow rotational movement. Ball and socket joints, like the hip and shoulder, offer a wide range of motion. Gliding joints, found in the wrists and ankles, allow bones to glide past each other in various directions.

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ProfBot

4mo ago

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Why is important to reduce friction at moveable joints?

Reducing friction at movable joints helps to improve movement efficiency, reduce wear and tear on the joint surfaces, and decrease the risk of injuries such as strains and sprains. This is especially important for athletes and individuals involved in physical activities that place repeated stress on the joints.


How are joints necessary?

Joints are necessary for providing movement and flexibility to the body. They allow bones to move smoothly against each other and are crucial for activities like walking, running, and lifting. Additionally, joints help distribute mechanical forces throughout the body to prevent injuries.


What are the four sensitive function of muscular sense?

The four sensitive functions of muscular sense include recognizing the amount of tension in muscles, perceiving the position of body parts without looking, detecting changes in joint angles and alignment, and coordinating movements for balance and posture.


What arrangement of moveable and fixed pulleys would give a mechanical advantage of 3?

One fixed pulley and two moveable pulleys would give a mechanical advantage of 3. The rope would go through the fixed pulley, then the first moveable pulley, back through the fixed pulley, and finally through the second moveable pulley.


Are joints the fulcrum of a lever?

No, joints are not the fulcrum of a lever. Joints are points in the body where two or more bones meet and allow movement. A fulcrum is the fixed point around which a lever pivots in order to create mechanical advantage.