The smallest blood vessels, which come into direct contact with all cells in the body, are called

______________ is a protein that transports oxygen throughout the body. It is found in red blood cells.

Which of these is not part of the circulatory system?

Which of these helps the immune system fight disease?

The heart pumps ____________ blood (from the lungs) through the body to the cells.

_____________ move blood away from the heart to the body cells while __________ move blood toward the heart.

The atria and ventricles are parts of your

__________ in the heart prevent blood from flowing backward.

Nutrients from the digestive system are absorbed into the blood in the villi of the _____________ then sent to the cells that need them.

A diet low in _______________ fat can reduce your chances of heart disease.

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