Question

1. What is the pathway of light ?

2. What is the pathway of sound?

3. What is the pathway of blood?

Answer 1

1. light through eye passes through the cornea --> aqueous humor ----> pupil --> lens ---> vitrous humor --- retina---> brain recieves signal as vision

2. sound waves travel first through the outer ear ----> through auditory canal ----> eardrum vibrates ---> ossicles, stirrup and anvil(bones in middle ear) move ----> via oval window ---> cochlea (inner ear) this step involve in stimulating hair cells which converts vibrations into elecrical impulse which is received by brain as sound signal.

3. blood from body first flows to superior and inferior vana cava ----> right atrium ----> tricuspid valve ----> right ventricle ---> through pulmonary valve ----> passes to pulmonary artery and finally to the lungs.