Neuroscience

Why sleep soothes distress: Neurobiology explained

A study published in Nature Reviews Neuroscience by an international team including the Woolcock's Dr. Rick Wassing examined research into sleep disorders over more than two decades to prove a good night's sleep is the perfect ...

Diseases, Conditions, Syndromes

Chlamydia vaccine shows promise in early trial

A chlamydia vaccine has triggered immune responses in an early trial, raising hopes that one day it might help curb the spread of the sexually transmitted infection (STI).

Diseases, Conditions, Syndromes

Expert explains pink eye

Pink eye is an inflammation of the lining of the eyelid and eyeball. The medical term for pink eye is conjunctivitis. The most noticeable symptom will be a pink or red irritated eye or eyes. Other symptoms can include:

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Eye

Eyes are organs that detect light, and send signals along the optic nerve to the visual and other areas of the brain[citation needed]. Complex optical systems with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in cnidaria, molluscs, chordates, annelids and arthropods.

The simplest "eyes", such as those in unicellular organisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms. From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment.

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