Summary Of Effects Of Adrenaline

Summary of Effects of Adrenaline Target Organ Liver

Heart

Effects of adrenaline 1) Increases rate of conversion of: Glycogen  Glucose 2) Arterioles dilate (become wider) 1) Rate & Force of heartbeat increases 2) Arterioles dilate

Breathing center of brain and gaseous exchange organs

1) Breathing rate increases 2) Arterioles in lungs dilate

Muscles (skeletal)

1) Become tense 2) Arterioles dilate

Blood vessels of kidney, skin & gut

Constrict (diameter becomes smaller)

Eye: radial muscles of iris

Contract  Pupils (opening) become bigger

Purpose & results 1) To increase blood sugar level so that more glucose is available for energy production (esp in muscles) 2) Person feels active 1) Send more blood containing oxygen and glucose to skeletal & heart muscles 2) Heart thumps rapidly 1) To breathe in more air and increase blood flow to lungs so that more oxygen is absorbed into blood & more carbon dioxide is got rid of from it 2) Person breathes rapidly (panting) 1) To prepare them for immediate action and increase blood flow to them 2) Person trembles and feels tense 1) Send less blood to these regions so more blood can flow to the muscles, liver and lungs 2) Person looks pale, mouth becomes dry 1) To allow more light to enter eye to form brighter images  helps to detect visual dangers in surroundings 2) Pupils dilate