Frog differs from man in

Options

A. having both renal and hepatic portal systems
B. not having renal portal system
C. having hepatic portal system.
D. not having hepatic portal system.

Answer

To answer the question "How does a frog differ from a man?", we will focus on the differences in their circulatory systems, specifically the presence of certain portal systems.

### Step-by-Step Solution:

1. **Understanding Circulatory Systems**:
- Both frogs and humans have circulatory systems that transport blood throughout the body.
- In humans, the circulatory system consists of two main branches: the pulmonary branch (between the heart and lungs) and the systemic branch (between the heart and body tissues).

2. **Human Circulatory System**:
- In humans, oxygenated blood is received from the lungs by the heart and pumped to the body tissues.
- Deoxygenated blood returns from the body tissues to the heart and is then sent to the lungs for oxygenation.
- Additionally, humans have a hepatic portal system which involves a special vein (the hepatic portal vein) that carries blood from the intestines to the liver.

3. **Frog Circulatory System**:
- Frogs also have a pulmonary branch and a systemic branch similar to humans.
- However, frogs possess an additional circulatory feature known as the renal portal system. This system carries blood from the lower parts of the body to the kidneys.

4. **Key Differences**:
- The main difference between frogs and humans in terms of their circulatory systems is that frogs have both a hepatic portal system (like humans) and a renal portal system, while humans do not have a renal portal system.
- Thus, frogs differ from humans because they have an additional renal portal system that is not present in humans.

### Conclusion:
Frogs differ from humans in that they possess both a hepatic portal system and a renal portal system, while humans only have a hepatic portal system.

---