Human Evolution Answers

Which of the following did you include in your response? Check all that apply.

spindle-shaped

attached to bones

voluntary

cells joined together by intercalated discs

not striated

found in heart

cells with many nuclei

When muscles contract, they become .

muscles move food down the digestive tract.

The muscles of the rear end, legs, and feet are called muscles.

When it is cold, shivering causesthe muscles to and

produce .

Which of the following did you include in your response? Check all that apply.

The myosin head rotates, causing overlap with actin.

The myosin head attaches to a binding site on the actin filament.

The myosin head detaches from one binding site and reattaches to another.

ions are necessary to activate the binding sites on the actin filaments.

The molecule is required each time the myosin head detaches from one site and reattaches to another.

The sarcomere shortens.