Write the functional activity of the following structures:IrisAqueous�

Write the functional activity of the following structures:IrisAqueous humourChoroid coat in the eyeEar drumEar ossicles

Answer»

Name	Function
Iris	It is a muscular screen made up of radial and circular muscles that control the diameter of the central opening—the pupil, according to the intensity of illumination.
Aqueous humour	It allows light rays to pass into the eye and prevents their refraction and dispersion.
Choroid coat in the eye	Choroid layer with many capillaries forms the nutritive layer of the eye. The extended choroid layer forms the pigmented muscular curtain called the iris. The aperture in the centre through which light enters the aperture is called the pupil.
Ear drum	It vibrates according to the sound waves and transmits them across the middle ear.
Ear ossicles	The vibrations of the ear drum are amplified and transmitted to the delicate membrane sketched along the oval window.