## **Core Concept**
The ventricular system of the heart consists of the right and left ventricles, which are responsible for pumping blood throughout the body and lungs. The interventricular septum is a wall of tissue that separates these two ventricles.

## **Why the Correct Answer is Right**
The **interventricular septum** is indeed a part of the ventricles of the heart, acting as a wall that divides the right and left ventricles. This septum is crucial for preventing the mixing of oxygenated and deoxygenated blood.

## **Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because, without a specific structure mentioned, it's impossible to assess its relevance to the ventricles.
* **Option B:** Similarly, this option lacks specificity and cannot be evaluated.
* **Option D:** This option is also unspecified and therefore cannot be considered correct.

## **Clinical Pearl / High-Yield Fact**
A key clinical correlation is that defects in the **interventricular septum** can lead to **ventricular septal defects (VSDs)**, which are a common congenital heart defect. VSDs can lead to significant morbidity if not addressed.

## **Correct Answer:** . interventricular septum