Question

Read the following statements and find out the incorrect statements.

a. Heart is situated in the thoracic cavity, between the two lungs, slightly tilted to the right.

b. Heart has the size of a clenched fist.

c. Heart is protected by double walled membranous bag, pericardium, enclosing the pericardial fluid.

d. Human heart has four chambers, two relatively larger upper chambers called atria and two smaller lower chambers called ventricles.

e. A thick muscular wall called the inter-atrial septum separates the right and the left atria, whereas a thin-walled inter-ventricular septum, separates the left and right ventricles.

Answer 1

Incorrect statements

Statement a

Heart is situated in the thoracic cavity between the two lungs, slightly tilted to the right.

Elaboration

Heart is situated in the thoracic cavity. It is located between the two lungs, slightly tilted to the left. Hence, the given statement is incorrect.

Statement d

Human heart has four chambers, two relatively larger upper chambers called atria and two smaller lower chambers called ventricles.

Elaboration

Human heart consist of four chambers-

• Two atria- Atria are smaller upper chambers in human heart which receive the blood from various body parts.
• Two ventricles- Ventricles are the larger lower chambers of human heart which pump the blood to various body parts.

Hence, the given statement is incorrect.

Statement e

A thick muscular wall called the inter-atrial septum separates the right and the left atria, whereas a thin-walled inter-ventricular septum, separates the left and right ventricles.

Elaboration

Human heart consist of four chambers- Two atria and two ventricles. The two atria are separated by a thin septum known as inter-atrial septum and the two ventricles are separated by a thick septum known as inter-ventricular septum.

Hence, the given statement is incorrect.

Final answer
(A) a, d and e