Examlex
Sperm are unable to fertilize the egg upon entry into the vagina and must undergo , allowing them to , which facilitates fertilization.
Vena Cava
The two large veins (the superior vena cava and the inferior vena cava) that carry deoxygenated blood from the body back to the heart.
Atrioventricular Valve
One of the two valves that separate the atrium and the ventricle in the heart, preventing backflow of blood.
Inferior Vena Cava
The large vein that carries de-oxygenated blood from the lower and middle parts of the body into the right atrium of the heart.
Valves
Structures in the heart and veins that maintain blood flow in one direction, preventing backflow.
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