What happens at the synapse between two neurons?

What are hormones? Name the hormone secreted by thyroid and state its function.

What are ‘nastic’ and ‘curvature’ movements? Give one example of each.

Name the two main organs of our central nervous system. Which one of them plays a major role in sending command to muscles to act without involving thinking process. Name the phenomenon involved.

Name and explain the function of the hormone secreted by the pituitary gland in humans.