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______________ is a protein that transports oxygen throughout the body. It is found in red blood cells.
capillaries
small intestine
heart
white blood cells
valves
oxygenated
lungs
hemoglobin
__________ in the heart prevent blood from flowing backward.
capillaries
small intestine
heart
white blood cells
valves
oxygenated
lungs
hemoglobin
Which of these helps the immune system fight disease?
capillaries
small intestine
heart
white blood cells
valves
oxygenated
lungs
hemoglobin
Which of these is not part of the circulatory system?
capillaries
small intestine
heart
white blood cells
valves
oxygenated
lungs
hemoglobin
Nutrients from the digestive system are absorbed into the blood in the villi of the _____________ then sent to the cells that need them.
capillaries
small intestine
heart
white blood cells
valves
oxygenated
lungs
hemoglobin
The heart pumps ____________ blood (from the lungs) through the body to the cells.
capillaries
small intestine
heart
white blood cells
valves
oxygenated
lungs
hemoglobin
The atria and ventricles are parts of your
capillaries
small intestine
heart
white blood cells
valves
oxygenated
lungs
hemoglobin
The smallest blood vessels, which come into direct contact with all cells in the body, are called
capillaries
small intestine
heart
white blood cells
valves
oxygenated
lungs
hemoglobin
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