The brain is responsible for

• thinking

• regulating the heart beat
• balancing the body

• all of the above

• Insulin
• Thyroxin
• Oestrogen
• Cytokinin

Secretion of milk is maintained by

• relaxin

• oestrogen
• prolactin

• progesterone

   

The gap between two neurons is called a 

• dendrite

• synapse

• axon

• impulse

Hormone is 

• enzymatic product  
• chemical messenger
• nerve impulse
• excretory product