Adrenaline. Polarized light micrograph of crystals of adrenaline (epinephrine). This is a hormone produced in the adrenal glands above the kidneys. Adrenaline is normally present in blood in small quantities. However,in times of stress large quantities are secreted into the blood- stream. Adrenaline widens the airways of the lungs,constricts small blood vessels and liberates sugar stored in the liver. This makes the muscles work harder and produce a "fight or flight" response. Adrenaline used as a drug expands the bronchioles in acute asthma attacks,or to stimulate the heart in cases of anaphylactic shock. Magnification: 50x | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Pasieka, Alfred |
Taille de l’image : | 4781 px × 3655 px |
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