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Which of the following formed elements is responsible for fighting infection?

Which layer of a blood vessel is composed of epithelial tissue?

Blood in the left atrium is …

Which of the following vessels contains valves?

Which of the following could result in circulatory shock?

The “lubb dupp” sound of the heart occurs because of …  

Which of the following types of pumps is not responsible for returning blood to the heart?

COPD, lung cancer, and asthma all result in the trapping of oxygen-poor, carbon dioxide-rich air in the lungs.

Which valve is present between the left atrium and left ventricle?

Describe how blood moves against gravity and is forced back to the heart from your lower extremities.