Target Organ Effects of Adrenaline Biological Advantages Effect or Sensation

Heart Beats faster Sends more glucose and oxygen to the muscles

Thumping heart

Breathing centre of the brain

Faster and deeperbreathing

Increased oxygenation of blood; rapid removal of carbondioxide

Panting

Arterioles of the skin Constricts them Less blood going to the skin means more is available to the muscles

Person goes paler

Arterioles of the digestive system

Constricts them Less blood for the digestive system allows more to reach the muscles

Dry mouth

Muscles of alimentary canal

relax Peristalsis and digestion slow down; mare energy available for action

Hollow feeling in the stomach

Muscles of body Tenses them Glucose available in blood for energy production

Tense feeling; shivering

liver Conversion of glycogen to glucose

Fatty acid available inblood, for muscle contraction

Fat depots Conversion of fats to fatty acids

No sensation