Adrenaline is released from adrenal gland, when a person is under stress or is involved in intensive exercise.

It is a condition resulting in short stature due to low secretion of growth hormone.

Medulla oblongata is a part of autonomic nervous system. It controls all the involuntary actions like breathing, respiration etc.

Salivary glands are known as exocorine because they release hormones directly into blood through duct.

Spinal cord is the elongation of medulla oblongata.

Testosterone is secreted by testes.

Reflex actions are only controlled by spinal cord without the involvement of brain. These reactions are automatic and do not involve thinking.

Cerebral cortex is the largest part of the brain. It is the wrinkled outer part of the brain.

It is a 'reaction' of an organism.

Sympathetic nervous system acts as a combat or escape system. In case of emergencies, the sympathetic system prepares the body to either face the challenge or flee. While doing so, it increases the heartbeat, constricts the blood vessels, raises the blood pressure, slows or stops digestion, dilates the pupil and so on. 

Digestive enzymes are secreted by the ducts of acini of pancreas. The exocrine component of pancreas consists of ducts of acini that produce the pancreatic fluid containing digestive juices.

The neurons communicate with one another via synapses wherein the axon terminal of one neuron lies very close to the dendrite of another neuron.

Sensory neurons carry impulses from the sense organs to either the spinal cord or the brain.

It maintains the balance of the body.

Cranial nerves originate from the brain.