Blood pressure is highest in the_____ and lowest in the_____.

Correct Answer: B

Rationale: Blood pressure is highest in the aorta, where blood is ejected from the heart, and lowest in the vena cavae, where blood returns to the heart.

Correct Answer: A

Rationale: The valves of the heart are made up of dense connective tissue, which provides the necessary strength and flexibility to withstand the pressure changes within the heart during the cardiac cycle.

Correct Answer: D

Rationale: The P wave on an ECG signifies atrial depolarization, initiating atrial contraction and subsequent ventricular filling.

Correct Answer: A

Rationale: Systemic circulation delivers blood to all body parts except the lungs, which are part of pulmonary circulation.

Correct Answer: C

Rationale: Capillaries lack smooth muscle, so they cannot constrict or dilate like arteries, arterioles, or veins.