Read the following statements and choose the correct option
Statement 1 : Atria receive blood from all parts of the body which subsequenctly flows to ventricles
Statement 2 : Action potential generated at sino-atrial node passes from atria to ventricles.

Options

A. Action mentioned in Statement 1 is de- pendent on action mentioned in State- ment 2
B. Action mentioned in Statement 2 is de- pendent on action mentioned in State-ment 1
C. Action mentioned in Statements 1 and 2 are independent of each other
D. Action mentioned in Statements 1 and 2 are synchronous.

Explanation

To solve the question, we need to analyze the two statements provided about the heart's functioning.

**Step 1: Analyze Statement 1**
- Statement 1 says, "Atria receive blood from all parts of the body which subsequently flows to ventricles."
- The heart has four chambers: two atria (right and left) and two ventricles (right and left).
- The right atrium receives deoxygenated blood from the body through veins (specifically the superior and inferior vena cavae).
- This blood then flows into the right ventricle, which pumps it to the lungs for oxygenation.
- Therefore, Statement 1 is **true**.

**Step 2: Analyze Statement 2**
- Statement 2 states, "Action potential generated at sino-atrial node passes from atria to ventricles."
- The sino-atrial (SA) node is known as the natural pacemaker of the heart. It generates electrical impulses (action potentials) that initiate the heartbeat.
- These impulses cause the atria to contract and push blood into the ventricles.
- After the atria contract, the electrical signal travels to the atrioventricular (AV) node and then to the ventricles, causing them to contract.
- Thus, Statement 2 is also **true**.

**Step 3: Conclusion**
- Both statements are true.
- The relationship between the two statements indicates that the action of the atria receiving blood (Statement 1) is dependent on the action potential generated at the SA node (Statement 2), which initiates the heart's contractions.

**Final Answer:**
Both statements are true.