Read the statements carefully & choose the correct option: Statement: i Exercise help in production of more LDL. Statement: ii Exercise help in increase in the number of blood cells. Statement: iii Exercise decreases the thickness of the walls of the heart.

Q: Read the statements carefully & choose the correct option: Statement: i Exercise help in production of more LDL. Statement: ii Exercise help in increase in the number of blood cells. Statement: iii Exercise decreases the thickness of the walls of the heart.

Read the statements carefully & choose the correct option: Statement: i Exercise help in production of more LDL. Statement: ii Exercise help in increase in the number of blood cells. Statement: iii Exercise decreases the thickness of the walls of the heart.

Question

Accepted Answer

The correct option is (2): Statement ii is correct but i & iii are incorrect

Detailed explanation of why it is correct:
Statement ii is accurate because chronic, regular exercise, particularly endurance training, serves as a powerful physiological stimulus for the body to enhance its oxygen-carrying capacity. The increased metabolic demand for oxygen prompts the kidneys to release more erythropoietin (EPO). This hormone, in turn, stimulates the bone marrow to accelerate the process of erythropoiesis, leading to an overall increase in the total mass and number of red blood cells (RBCs) in circulation. This hematological adaptation is crucial for improving maximal oxygen uptake (VO2max), endurance performance, and overall cardiovascular efficiency, thereby confirming the correctness of Statement ii.

The incorrect option is (1): All three statements are correct.
This option is incorrect because both Statement i and Statement iii are factually wrong regarding the effects of exercise on the body. Statement i suggests an unhealthy outcome by promoting LDL (bad cholesterol) production, while exercise actually improves the lipid profile by increasing HDL and lowering LDL. Statement iii suggests that exercise decreases the thickness of heart walls, which is the opposite of the healthy, beneficial adaptation known as eccentric hypertrophy or 'Athlete's Heart,' where the heart muscle walls thicken and strengthen.

The incorrect option is (3): Statement i & ii are correct but iii is incorrect.
This option is incorrect because it incorrectly assumes Statement i is correct. As students of physical education should know, regular exercise is a cornerstone of heart-healthy living precisely because it improves the balance of lipoproteins, specifically working to decrease the 'bad' LDL cholesterol and typically increase the 'good' HDL cholesterol. Therefore, the assertion that exercise increases LDL production is physiologically unsound, which makes this option false.

The incorrect option is (4): Statement ii & iii are correct but i is incorrect.
This option is incorrect because it falsely validates Statement iii, asserting that exercise decreases heart wall thickness. In a healthy, trained athlete, the chronic stress of endurance exercise leads to a structural change in the heart—a beneficial thickening (hypertrophy) of the left ventricular wall. This allows the heart to pump a greater volume of blood per beat (increased stroke volume). A decrease in heart wall thickness, conversely, would indicate a detrimental or pathological response.