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9. How can the lamprey increase the available surface area of its intestines? What does this tissue help the lamprey to achie
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Ans 9) Small Intestine:
Cardinal veins is the region which is parallel to heart and in the dorsal region of heart is the small intestine. And in the inner surface there are numerous folds which is called typhosole which functions in increasing the surface area. Lamfrey do not have stomach. There is a valve between the region of oesophagus and small intestine.

Ans 10) CNS :

1. It includes brain and spinal cord.

2. The main function of CNS is organizing and analysing the information and then respond accoding to it.

3. Brain has different region : cerebrum , midbrain and hindbrain.

4. A group of neuron in CNS is known as nucleus.

PNS :

1. It includes motor neuron , sensory neuron and neurons.

2. The main function of PNS is to follow the instructions of Central Nervous System.

3. PNS has 2 parts : somatic nervous system and autonomous nervous system.

4. A group of cell body is called ganglion in PNS.

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