The valve that prevents backflow from the aorta into the left ventricle is the ________ semilunar valve.

The structure that transports urine from the kidney to the urinary bladder is the ________.

The organ that stores and concentrates bile between meals is the ________.

The insoluble protein strands that stabilize the blood clot are composed of ________.

The nitrogenous waste product formed from protein catabolism that is excreted in urine is ________.

The large gland that produces bile and plays a central role in metabolism is the ________.

The microscopic air sacs of the lungs where gas exchange occurs are called ________.

The iron-containing protein in red blood cells that binds oxygen is ________.

The pancreatic hormone that raises blood glucose by stimulating glycogen breakdown is ________.

The external male reproductive organ composed of erectile tissue and used for copulation is the ________.