Question

Why does cor pulmonale develop with chronic pulmonary disease?

A. demands on the left ventricle are excessive

B. the right ventricle pumps more blood than the left ventricle

C. too much blood comes back from the lungs

D. pulmonary fibrosis and vasoconstriction increase vascular resistance E. thrombosis occurs in pulmonary circulation

Answer 1

Answer ---- [D]

Cor pulmonale is the alteration in the structure and functions of the right ventricle which occurs due to the pulmonary hypertension

Cor pulmonale developes from chronic pulmonary disease because of pulmonary fibrosis which is scarring of the tissue and vasoconstriction increase blood resistance which increases pressure in pulmonary arteries which takes blood to the lungs and as a result of this high pressure in lungs to overcomes this becomes the reason for cor pulmonale

However it doesnot occurs due to any excessive load of the left ventricle which is not related to this as it supplies the oxygenated blood in body and so option first is inappropriate.

Pumping blood more or less is different when there is case of pulmonary hypertension due to any occlusion or thrombosis or embolism it causes the alteration and results in cor pulmonale so answer b is inappropriate.

Too much blood comes back from the lungs is alone is not sufficient in creating cor pulmonale any pathology is also required for cor pulmonale so answer (D) is more appropriate.