How many contraction nodes are found in heart of Human `:-`

Options

A. One
B. Two
C. Many
D. None

Answer

To answer the question "How many contraction nodes are found in the heart of a human?", we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Nodes in the Human Heart**:
- The human heart contains specialized tissues known as nodes that play a crucial role in regulating heart contractions.

2. **List the Main Nodes**:
- There are two primary nodes in the human heart:
- **Sinoatrial Node (SA Node)**: This node is often referred to as the pacemaker of the heart. It is located in the upper wall of the right atrium and is responsible for generating electrical impulses that initiate heartbeats.
- **Atrioventricular Node (AV Node)**: This node is located near the bottom of the right atrium. It receives impulses from the SA node and delays them for a brief period, allowing the atria to contract and fill the ventricles with blood before the ventricles contract.

3. **Confirm the Number of Nodes**:
- Since we have identified the SA node and the AV node, we can conclude that there are a total of **two contraction nodes** in the human heart.

4. **Final Answer**:
- Therefore, the answer to the question is that there are **two contraction nodes** found in the heart of a human.