Question

4. This figure (part a) shows a segment of the ventral nerve cord of the crayfish (which is analogous to our spinal cord). The lateral giant nerve fiber runs down this nerve cord and passes a signal to the motor giant neuron, which triggers muscle contraction in a tail flip escape response. Look at the neural recording that is shown (part b). It shows the presynaptic action potential of the lateral giant neuron and the postsynaptic action potential of the motor giant neuron. a. Judging from the recording (b), is this an electrical or chemical synapse? How can you tell? Motor gian b. Explain how this kind of synapse works Lateral giant Lateral giant (6) Ims Motor giant Segmental synapse Synapse Anterior

Answer 1

The synapse of the ventral nerve cord is electrical type because it's action potential time is very less. As it functions as spinal cord of human body, it has to be so rapid.

In arthropods, ventral nerve cord functions like spinal cord of our body.

It take sensory stimulus and give locomotive outputs.

Anterior side segmental ganglia function in anterior region and give connections to ventral regions.

Whereas , from anterior to posterior , the ganglion goes and supplies both side by commissure.

Thank you