Ans.
Circulatory system can be defined as the body system that transports nutrients, carbon dioxide, oxygen and other substances to the various body tissues and organs through bloodstream.
It involves pulmonary circulation and systemic circulation. During pulmonary circulation, deoxygenated blood from all of the body to heart, from where blood travels to lungs and becomes oxygenated. During systemic circulation, heart provides oxygenated blood to rest of the body.
The largest pulmonary artery (also known as pulmonary trunk) is responsible for the blood flow to the lungs away from the right side of heart.
Thus, the correct answer is option). 'blood travels away from the heart via the pulmonary trunk.'
