What is the function of joints in the human body?

To connect bones and allow movement

How do hinge joints function?

They permit movement in only one direction, like a door hinge

They allow movement in all directions

They enable bones to slide over one another

What makes ball-and-socket joints unique?

They allow rotational movement in all directions

They only allow movement forward and backward

They connect bones without flexibility

Why can't bones and joints move on their own?

They are not connected to each other

How do muscles enable movement?

By contracting and shortening their specialized cells

By stretching and pushing bones

By expanding and releasing energy

Why is the agonist muscle called the "agonist"?

Because it experiences strain or ‘agony’ during contraction

Because it pushes the bone instead of pulling it

What is the role of the agonist muscle in movement?

It contracts and performs the action

It prevents movement from occurring

It lengthens and stabilizes the joint

What happens to the antagonist muscle during movement?

It relaxes or lengthens to allow movement

It contracts along with the agonist muscle

Why can muscles only pull and not push?

They generate force by contracting (getting shorter)

They can only move in one direction

Why can’t the biceps muscle straighten the arm after bending it?

Muscles can only pull, not push

It is not connected to the right bones

The brain does not send the correct signal

How does the triceps muscle help straighten the arm?

By contracting and pulling the arm straight

By expanding and creating space

What are the only two actions that muscles can perform?

Contract (shorten) and relax (lengthen passively)

7.4 Moving the Body

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