Question

Read the statements and choose the night option

a. Heart is situated in the thoracic cavity, slightly tilted to the left b. It is protected by a double walled membraneous bag, enclosing pleural fluid c. The atrium and the ventricle of the same side are separated by thin muscular tissue atrioventricular septum d. Tricuspid and bicuspid valves prevent any backward flow or blood

• A. All are true
• B. a, d are true b and c are false
• C. a, b are true, c and d are true
• D. a, c are true, b and d are false

Answer 1

Answer: (B)

a, d are true b and c are false

Answer 2

The human heart is a vital organ responsible for pumping blood throughout the body. Let's analyze each statement:

• a. Heart is situated in the thoracic cavity, slightly tilted to the left.

  This statement is true. The heart is located in the mediastinum, a central compartment of the thoracic cavity, and its apex is indeed tilted slightly to the left.

• b. It is protected by a double walled membraneous bag, enclosing pleural fluid.

  This statement is false. The heart is protected by a double-walled membranous sac called the pericardium. This pericardium encloses pericardial fluid, not pleural fluid. Pleural fluid is found in the pleural cavity surrounding the lungs.

• c. The atrium and the ventricle of the same side are separated by thin muscular tissue atrioventricular septum.

  This statement is false. The atrium and ventricle of the same side are separated by an atrioventricular septum. However, this septum is primarily composed of fibrous connective tissue, not thin muscular tissue. The interatrial septum (between the two atria) and the interventricular septum (between the two ventricles) are muscular.

• d. Tricuspid and bicuspid valves prevent any backward flow or blood.

  This statement is true. The tricuspid valve is located between the right atrium and right ventricle, and the bicuspid (mitral) valve is located between the left atrium and left ventricle. Both these valves, along with the semilunar valves, ensure unidirectional blood flow through the heart and prevent the backflow of blood (regurgitation) into the preceding chamber.

Conclusion:

Statements 'a' and 'd' are true. Statements 'b' and 'c' are false.

Therefore, the correct answer is "a, d are true b and c are false".