Which mechanism controls the timing and amount of hormone released?

Answer the following:
$(a)$ Which hormone is responsible for the changes noticed in females at puberty?
$(b)$ Dwarfism results due to deficiency of which hormone?
$(c)$ Blood sugar level rises due to deficiency of which hormone?
$(d)$ Iodine is necessary for the synthesis of which hormone?

What are voluntary and involuntary actions? Give one example of each.

Write true or false for the statement: Deficiency of calcium in our diet causes goitre.

Explain how the human body responds when adrenaline is secreted into the blood.

Trace the sequence of events through a reflex arc that occurs when a bright light is focused on your eyes.