In these following correct statement about the heart are
I. The sino-atrial node (SAN) is present in the right top corner of the right atrium
II. Ligamentum arteriosum connects the aorta and pulmonary trunk.
III. Purkinje fibres constituent a portion of the bundle of His .
IV. The pulmonary trunk connects the right ventricle to the lungs

Options

A. I and II
B. II and IV
C. I ,II and IV
D. I,II and III

Answer

To solve the question regarding the correct statements about the heart, we will analyze each statement one by one.

### Step 1: Analyze Statement I
**Statement I:** The sino-atrial node (SAN) is present in the right top corner of the right atrium.
- The sino-atrial node is indeed located in the right atrium, specifically at the junction of the superior vena cava and the right atrium. Thus, this statement is **correct**.

**Hint:** Remember the location of the sino-atrial node; it is crucial for initiating heart contractions.

### Step 2: Analyze Statement II
**Statement II:** Ligamentum arteriosum connects the aorta and pulmonary trunk.
- The ligamentum arteriosum is a fibrous remnant of the ductus arteriosus, which connects the aorta and the pulmonary trunk in fetal life. After birth, it becomes the ligamentum arteriosum. Therefore, this statement is also **correct**.

**Hint:** Think about the fetal circulation and how the ductus arteriosus transforms after birth.

### Step 3: Analyze Statement III
**Statement III:** Purkinje fibres constitute a portion of the bundle of His.
- Purkinje fibers are specialized fibers that conduct impulses in the heart, but they are not a part of the bundle of His. Instead, they branch from the bundle of His. Therefore, this statement is **incorrect**.

**Hint:** Distinguish between the bundle of His and Purkinje fibers; they are related but not the same.

### Step 4: Analyze Statement IV
**Statement IV:** The pulmonary trunk connects the right ventricle to the lungs.
- The pulmonary trunk carries deoxygenated blood from the right ventricle to the lungs for oxygenation. This statement is therefore **correct**.

**Hint:** Recall the function of the pulmonary trunk in the circulatory system.

### Conclusion
After analyzing all four statements:
- Statement I: Correct
- Statement II: Correct
- Statement III: Incorrect
- Statement IV: Correct

The correct statements about the heart are **I, II, and IV**.

**Final Answer:** The correct statements about the heart are I, II, and IV.