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 dependent on action mentioned in Statement 2
B. Action mentioned in Statement 1 is dependent on action mentioned in Statement 1
C. Actions mentioned in Statements 1 and 2 are independent of each other
D. Actions mentioned in Statement 1 and 2 are synchronous

Answer

To analyze the statements provided in the question, we will break down each statement step by step.

### Step-by-Step Solution:

1. **Understanding Statement 1**:
- Statement 1 claims that "Atria receive blood from all parts of the body which subsequently flows to ventricles."
- The human heart has four chambers: two atria (upper chambers) and two ventricles (lower chambers).
- The right atrium receives deoxygenated blood from the body through the superior and inferior vena cavae, while the left atrium receives oxygenated blood from the lungs via the pulmonary veins.
- Therefore, this statement is correct as the atria do receive blood from the body and lungs, which then flows into the ventricles.

2. **Understanding Statement 2**:
- Statement 2 states that "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 heartbeats.
- These impulses spread through the atria, causing them to contract and push blood into the ventricles.
- The action potential then travels to the atrioventricular (AV) node, and from there, it spreads to the ventricles.
- Thus, this statement is also correct as the action potential does indeed pass from the atria to the ventricles.

3. **Conclusion**:
- Both statements are correct. Statement 1 is dependent on Statement 2 because the flow of blood from the atria to the ventricles is facilitated by the action potential generated by the SA node.
- Therefore, the correct option is that both statements are true.

### Final Answer:
Both Statement 1 and Statement 2 are correct.

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