1- Which of the following mechanisms help blood fight gravity so that, for insta

Question

1- Which of the following mechanisms help blood fight gravity so that, for instance, it can return from blood vessels in your feet back into your heart? (there may be more than one answer) Select one or more: a. breathing allows the pressure in your chest to decrease and allow blood to flow up towards your heart b. as you walk, the skeletal muscles in your legs contract and squeeze the veins; since veins have valves, blood flows up and doesn't backflow back down. c. the force of blood flowing out of the heart and into the arteries pushes all of the blood along, causing blood to return to the heart d. precapillary sphincters open to allow blood to flow back towards the heart

2- The following sequence represents the correct order of blood flow through the heart:

inferior and superior vena cava --> right atrium --> right ventricle --> pulmonary artery --> lungs --> pulmonary vein --> left atrium --> left ventricle --> aorta

Select one:

True

False. Explain

Explanation / Answer

Q1). All the above options are correct

2Q). True

Inferior & superior vena cava collecte deoxygenated blood from all parts of the body and pumps into right atrium and then to right ventricle. Then the deoxygenated blood will be carried to lungs by pulmonary artery, where the blood will be purified and become oxygenated. The oxygenated blood will be pumped into left atrium via pulmonary vein and then to left ventricle and then to body parts via aorta.

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