Question
Describe (a) pulmonary circulation and (b) systemic circulation. Mention their significance/ importantce.
✓
Answer
- Pulmonary circulation:
- It starts with the right ventricle pumping the deoxygenated blood into the pulmonary artery.
- When the blood reaches the lungs, it is oxygenated.
- The oxygenated blood is carried by the pulmonary veins to the left atrium.
- Systemic circulation
- It starts with the left ventricle pumping the oxygenated blood into the aorta.
- The blood is carried by a network of arteries, arterioles and capillaries to all parts of the body.
- The deoxygenated blood from all parts of the body is collected by a system of venules, veins and ultimately poured into the right atrium by the superior vena cava and inferior vena cava.
- This pathway provides nutrients, oxygen and other essential substances to all parts of the body and removes the metabolic wastes and other harmful substances for elimination (excretion) from the body.
- The coronary system of blood vessels is meant for circulation of blood to the cardiac muscles.
- The hepatic portal system supplies the nutrients from the intestine to the liver.
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