Fluorescence light micrograph of nerve fibres (white) in the iris muscle of a rat's eye,showing the envelopment of a blood vessel (running left to right) by nerve fibres. The section is prepared to show the noradrenaline content of the nerve fibres. Noradrenaline & its relative adrenaline (catecholamine hormones) are released by the medulla of the adrenal glands in response to acute physical & psychological stress; the released catecholamines act on adrenergic receptors throughout body,particularly in heart,lungs,blood vessels,and visceral & skeletal muscle. The adrenergic nerve fibres in the iris cause dilation of the pupil. Magnification: X 16 at 35mm size | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Jacobowitz, Dr. David |
Bildgröße: | 5103 px × 3543 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |