Question

Blood circulation in human is

• A. Single and open
• B. Double and open
• C. Double and close
• D. Single and close

Answer 1

The correct option is C Double and close

• Humans have double circulation. The blood pumped by the right ventricle enters the pulmonary artery, whereas the left ventricle pumps blood into the aorta.
• The deoxygenated blood pumped into the pulmonary artery is passed onto the lungs from where the oxygenated blood is carried by the pulmonary veins into the left atrium.
• This pathway constitutes the pulmonary circulation.
• The oxygenated blood entering the aorta is carried by a network of arteries, arterioles, and capillaries to the tissues from where the deoxygenated blood is collected by a system of venules, veins, and vena cava and emptied into the right atrium. This is the systemic circulation.
  Hence, the correct option is C.