Arrange blood flow from ventral to dorsal blood vessels
(a) Dorsointestinal blood vessels
(b) External intestinal plexus
( c) Internal intestinal plexus
(d) Ventrointestinal blood vessel

Options

A. d, b, a, c
B. c, a, b, d
C. b, c, d, a
D. d, b, c, a

Answer

To arrange the blood flow from ventral to dorsal blood vessels, we will follow the correct sequence based on the given options. Here’s the step-by-step solution:

1. **Identify the starting point**: The blood flow begins at the ventral side, which is represented by the **ventrointestinal blood vessel** (d).

2. **Next step in the flow**: After the blood leaves the ventrointestinal blood vessel, it moves to the **external intestinal plexus** (b). This is the next structure that the blood encounters.

3. **Continuing the flow**: From the external intestinal plexus, the blood then flows into the **internal intestinal plexus** (c). This is the third step in the sequence.

4. **Final destination**: Finally, the blood reaches the **dorsointestinal blood vessel** (a), which is the dorsal side of the blood flow path.

5. **Arranging the order**: Based on the flow we have identified, the correct order from ventral to dorsal is:
- Ventrointestinal blood vessel (d)
- External intestinal plexus (b)
- Internal intestinal plexus (c)
- Dorsointestinal blood vessel (a)

Thus, the final arrangement of blood flow from ventral to dorsal blood vessels is **DBCA**.