Select the incorrect statement.

Options

A. Renal portal system in absent in mammals
B. Medulla oblongata can modulate cardiac function through autonomic nervous system
C. Hepatic vein caarries blood from intestine to liver
D. In human, heart beat is initiated by specialised nodal tissue, hence the heart is called myogenic

Answer

To solve the question of selecting the incorrect statement, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: Renal portal system is absent in mammals.**
- The renal portal system is indeed absent in mammals. This system is found in some other vertebrates, like reptiles and amphibians, but mammals have evolved differently and do not require this system for their renal function.
- **Conclusion:** This statement is **true**.

2. **Statement 2: Medulla oblongata can modulate cardiac function through the autonomic nervous system.**
- The medulla oblongata is a part of the brainstem that plays a crucial role in autonomic functions, including the regulation of heart rate. It contains centers that can influence cardiac function through the autonomic nervous system. Therefore, this statement is incorrect as it suggests that the medulla oblongata cannot modulate cardiac function.
- **Conclusion:** This statement is **false**.

3. **Statement 3: Hepatic vein carries blood from intestine to liver.**
- The hepatic vein does not carry blood from the intestine to the liver; instead, the hepatic portal vein is responsible for this function. The hepatic vein carries blood away from the liver to the heart. Hence, this statement is also incorrect.
- **Conclusion:** This statement is **false**.

4. **Statement 4: In the human heart, the heartbeat is initiated by specialized nodal tissue; hence the heart is called myogenic.**
- The heartbeat in humans is indeed initiated by specialized nodal tissues, specifically the sinoatrial (SA) node. This characteristic makes the heart myogenic, meaning it generates its own rhythm.
- **Conclusion:** This statement is **true**.

### Final Conclusion:
The incorrect statement is **Statement 2: Medulla oblongata can modulate cardiac function through the autonomic nervous system.**