Give three examples of reflex actions.

Which one term in each of the following includes the other three?

(a) thyroid, ductless gland, thymus, pituitary, ovary

(b) adrenalin, insulin, hormone, thyroxine, estrogen

Which parts of the body form the central nervous system?

Why do you need iodine in your diet?

State whether coughing is a voluntary action or reflex action.