Specialvenous connection between the heart and the liver in frogs is the

Options

A. Renal portal system
B. Lymphatic system
C. Hepatic portal system
D. Pulmonary system

Answer

### Step-by-Step Solution

1. **Understanding the Question**: The question asks for the special venous connection between the heart and the liver in frogs.

2. **Identifying the Circulatory System**: In frogs, the circulatory system includes a mixture of oxygenated and deoxygenated blood. This is different from mammals, where the separation is more distinct.

3. **Recognizing the Role of Capillaries and Veins**: Blood flows from capillaries into veins. In the case of frogs, this connection is crucial for the liver's function.

4. **Defining the Special Connection**: The special venous connection that links the heart and the liver is known as a "portal system."

5. **Specific Name of the Portal System**: In frogs, this portal system is specifically referred to as the "hepatic portal system."

6. **Function of the Hepatic Portal System**: The hepatic portal system is responsible for transporting blood from the gastrointestinal tract and spleen to the liver. This allows the liver to process nutrients and detoxify substances before the blood returns to the heart.

7. **Final Answer**: Therefore, the special venous connection between the heart and the liver in frogs is called the **hepatic portal system**.