In the heart of rabbit the bicuspid (mitral ) valve is situated between

Options

A. right ventricle and pulmonary aorta
B. left auricle and left ventricle
C. right auricle and right ventricle
D. postcaval and right auricle

Explanation

To solve the question about the location of the bicuspid (mitral) valve in the heart of a rabbit, we can follow these steps:

### Step 1: Understand the Structure of the Heart
The heart of a rabbit, like that of other mammals, consists of four chambers: two atria (auricles) and two ventricles. The left side of the heart contains the left atrium (auricle) and the left ventricle.

**Hint:** Remember that the heart has four chambers: two atria and two ventricles.

### Step 2: Identify the Bicuspid (Mitral) Valve
The bicuspid valve, also known as the mitral valve, is a flap-like structure that controls blood flow between the left atrium and the left ventricle. It is called "bicuspid" because it has two cusps.

**Hint:** The term "bicuspid" refers to the two flaps of the valve.

### Step 3: Determine the Function of the Bicuspid Valve
The primary function of the bicuspid valve is to allow blood to flow in one direction—from the left atrium to the left ventricle—while preventing backflow into the atrium.

**Hint:** Think about how valves work to ensure unidirectional blood flow.

### Step 4: Eliminate Other Options
- The semilunar valve is located between the right ventricle and the pulmonary aorta.
- The tricuspid valve is located between the right atrium and the right ventricle.
- The postcaval vein connects to the right atrium but does not involve the bicuspid valve.

**Hint:** Compare the locations of the other valves to confirm the correct position of the bicuspid valve.

### Step 5: Conclusion
Based on the above analysis, the bicuspid (mitral) valve is situated between the left auricle (atrium) and the left ventricle.

**Final Answer:** The bicuspid (mitral) valve is situated between the left auricle and the left ventricle.