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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. 

Reabsorption occurs on the arterial side of the capillary bed.

Which type of capillary is the least permeable?

Describe how oxygen and carbon dioxide are transported through the blood. 

What part of the respiratory system do your paranasal sinuses connect?

The trachea splits into how many primary bronchi that enter the lung?

The influx of what ion causes cells in the conduction system to rapidly depolarize from -40mV to a slightly positive value?