Valve that guards the right auriculoventricular aperture is

Options

A. Coronary valve
B. Tricuspid valve
C. Bicuspid valve
D. Semilunar valve

Answer

To answer the question "Valve that guards the right auriculoventricular aperture is:", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure**: The question asks about a valve that is located between the right atrium and the right ventricle. This is known as the right auriculoventricular aperture.

2. **Understand the Types of Valves**: There are two main types of atrioventricular valves in the heart:
- **Tricuspid Valve**: Located between the right atrium and right ventricle.
- **Bicuspid Valve (Mitral Valve)**: Located between the left atrium and left ventricle.

3. **Characteristics of the Valves**:
- The **tricuspid valve** has three flaps (cusps), which is why it is named "tricuspid."
- The **bicuspid valve** has two flaps, hence the name "bicuspid" or "mitral."

4. **Function of the Valves**: The primary function of these valves is to prevent the backflow of blood. They ensure that blood flows in one direction—from the atria to the ventricles.

5. **Conclusion**: Since the question specifically asks about the valve guarding the right auriculoventricular aperture, the correct answer is the **tricuspid valve**.

### Final Answer:
The valve that guards the right auriculoventricular aperture is the **Tricuspid Valve**.