21) The three branches of the aortic arch are the brachiocephalic trunk, left common carotid artery, and the left subclavian artery.

22) The brachial artery branches to form the femoral and popliteal arteries. 

23) The common iliac vein drains blood into the inferior vena cava.

24) Veins draining the head and arms empty into the inferior vena cava.

25) The hepatic veins drain the blood from the liver and returns it to the inferior vena cava.

26) The circle of Willis involves blood flow through the liver.

27) The major vessels involved in hepatic portal circulation are the inferior and superior mesenteric arteries, the splenic artery, and the left gastric artery.

28) The umbilical vein carries blood rich in nutrients and oxygen to the fetus.

29) In fetal circulation, blood travels directly from the right atrium to the left atrium through the foramen ovale.

30) Diastolic pressure is the blood pressure in the arteries at the peak of ventricular contraction.

31) An increase in blood vessel diameter causes arterial blood pressure to decrease.

32) Hypotension is diastolic blood pressure below 100 mm Hg.

33) Blood cells and proteins typically cannot pass across the walls of capillaries and are thus prevented from leaving or entering the capillaries.

A) right ventricle

B) left atrium

C) right atrium

D) left ventricle

E) right atrium