Part D: The Circulatory Systemm I. What functions are performed by the circulato

Question

Part D: The Circulatory Systemm I. What functions are performed by the circulatory system? 2. What does the thymus gland do? What happens to it later in life? 3. What causes heart attacks? 4. What is the pericardium? 5. What differences between the atria and the ventricles can you feel with your fingers? 6. Into what heart chamber does the superior and posterior vena cava open? 7. From what chamber does the aorta arise? 8. To what structures do the pulmonary arteries lead? 9. Why does the ductus arteriosus close off at the time of birth? 10. What is the function of coronary circulation? 11. What results when coronary circulation is prevented in humans? 12. Describe, in detail, the interior of the lungs

Explanation / Answer

Answere :

Question 1 : Function of circulatory system : (i)Circulatory system is important for transporting material from one part of body to another like food, water, oxygen etc. (ii) It carry waste material such as carbon diooxide away from the cells.

Question 2 : Thymus gland is two lobed organ located under sternum. It is fairly large during childhood but begins to disappear onset of puberty, becoming a small mass of connective tissue and fat in adulthood. It produce a hormone i.e. thymosin that stimulate developement of T cells. Both positive and negative selection of T cells takes place in thymus.

Question 3 : Coronary arteries (supplying heart blood) bring oxygen and nutrient to the heart muscles itselfs. Blockage of coronary arterties may damage or kill parts of muscles due to lack of oxygen. This causes heart attack.

Question 4 : Pericardium is the fluid filled sac that surrounds the heart and proximal end of aorta, venae cavae and pulmonery artery. It serves as outer protecting covering of the heart.

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