Question

1. blood returns from the lungs during pulmonary circulation via the:a. pulmonary arteryb. pulmonary veinsc. aortad. inferior vena cava40. the hepatic portal circulation serves the body by:a. removing excess glucose and storing it in the liver as glycogenb. detoxifying bloodc. removing various poisonous substances present in bloodd. all of the above41. the structure used to bypass the liver in fetal circulation is the:a. foramen ovaleb. ductus venosusc. ductus arteriosusd. umbilical vein42. the foramen ovale serves the fetal circulation by:a. connecting the aorta and the pulmonary arteryb. shunting blood from the right atrium directly into the left atriumc. bypassing the liverd. bypassing the lungs43. the structure used to connect the aorta and pulmonary artery in fetal circulation is the:a. ductus arteriosusb. ductus venosusc. aortad. foramen ovale44. which of the following is not an artery?a. femoralb. poplitealc. coronaryd. inferior vena cava45. which of the following has valves to assist the blood flow?a. veinsb. arteriesc. capillariesd. arterioles

Explanation:

1. Pulmonary veins carry oxygenated blood from lungs to heart.
2. Hepatic portal circulation handles glucose storage, detoxification, and toxin removal via the liver.
3. Ductus venosus bypasses the fetal liver to send blood to the systemic circulation.
4. Foramen ovale shunts blood between right and left atria, bypassing fetal lungs.
5. Ductus arteriosus connects fetal aorta and pulmonary artery.
6. Inferior vena cava is a vein, not an artery.
7. Veins have one-way valves to prevent blood backflow.

Answer:

1. B. Pulmonary veins
2. D. All of the above
3. B. Ductus venosus
4. D. Bypassing the lungs
5. A. Ductus arteriosus
6. D. Inferior vena cava
7. A. Veins