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 carries 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 option provided in the question step by step.

### Step 1: Analyze Option 1
**Statement:** "Renal portal system is absent in mammals."
- The renal portal system is indeed derived from the posterior cardinal veins and is present in fishes, amphibians, and reptiles. However, it is absent in mammals.
- **Conclusion:** This statement is **correct**.

### Step 2: Analyze Option 2
**Statement:** "Medulla oblongata can modulate cardiac function through the Autonomic Nervous System."
- The medulla oblongata plays a crucial role in regulating heart rate and can indeed modulate cardiac function through the autonomic nervous system. It receives signals from sympathetic and parasympathetic nerves to adjust heart rate.
- **Conclusion:** This statement is **correct**.

### Step 3: Analyze Option 3
**Statement:** "Hepatic veins carry blood from the intestine to the liver."
- This statement is incorrect because hepatic veins carry deoxygenated blood from the liver back to the heart, not from the intestine to the liver. The blood from the intestine is carried to the liver by the hepatic portal vein.
- **Conclusion:** This statement is **incorrect**.

### Step 4: Analyze Option 4
**Statement:** "In humans, heartbeat is initiated by special nodal tissue."
- The heartbeat in humans is initiated by the sinoatrial (SA) node, which is a specialized nodal tissue. This is indeed correct and is why we refer to the human heartbeat as myogenic.
- **Conclusion:** This statement is **correct**.

### Final Conclusion
After analyzing all the statements, we find that the incorrect statement is **Option 3**: "Hepatic veins carry blood from the intestine to the liver."

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