Correct Option
The correct option is (c).
Explanation
The human heart is a mesodermally derived muscular organ situated in the thoracic cavity. It functions as the central pumping station of the circulatory system, ensuring the transport of oxygen, nutrients, and waste products throughout the body.
Statement-wise Analysis
- Statement 1 is Incorrect. The primary function of the heart is to pump blood, not to store it. While the heart holds blood temporarily within its chambers during the cardiac cycle, it does not act as a reservoir or storage organ like the spleen or liver. Its continuous rhythmic contractions drive the flow of blood.
- Statement 2 is Correct. The heart is located in the chest cavity (thoracic cavity) between the two lungs. Its lower tip, known as the apex, is tilted slightly towards the left side. This orientation is why the heartbeat is felt more strongly on the left side of the chest.
- Statement 3 is Correct. The human heart consists of four chambers: two upper chambers called atria and two lower chambers called ventricles. This four-chambered structure, separated by septa, ensures that oxygenated blood (left side) and deoxygenated blood (right side) do not mix. This separation allows for an efficient supply of oxygen to the body and is characteristic of birds and mammals.
Key Takeaway: The human heart is a four-chambered muscular pump located in the thoracic cavity with a leftward tilt. Its structure prevents the intermixing of oxygenated and deoxygenated blood, supporting high metabolic efficiency.