Sense Organs SAQs.docx

The Human Sense Organs SAQs - List the 5 human senses and their respective sense organ.  1. Taste , tongue  Sight, eyes  Hearing, ears Touch, skin  Smell, nose  - What is the function of the sclera?  1. It protects the eye and gives the eye shape.  - What is the function of the ret...

The Human Sense Organs SAQs - List the 5 human senses and their respective sense organ.  1. Taste , tongue  Sight, eyes  Hearing, ears Touch, skin  Smell, nose  - What is the function of the sclera?  1. It protects the eye and gives the eye shape.  - What is the function of the retina?  1. It is the innermost light-sensitive layer of rods and cones that convert light into nerve impulses.  - What is accommodation?  1. The ability of the lens to change shape to form a clear image.  - Where are rods and cones located in the eye?  1. the retina  - What is the function of the optic nerve?  1. carries impulses from the retina to the brain  - Name 3 differences between rods and cones 1. there are 120 million rods and 6 million cones per eye/ rods detect black and white and cones detect colours/ rods help us see in dim light and cones help us see in bright light/ rods are located all over the retina and cones are located mostly at the fovea.  - Name a defect of the eye and its corrective measure 1. Defect = Short sighted / myopia Corrective measure = using a concave lens  Defect = Long sighted / hypermetropia  Corrective measure = using a convex lens  - What is the function of the pinna?  1. funnels sound into the ear canal.  - What is the function of the semicircular canals? 1. They detect the direction of motion and acceleration and are responsible for balance  - What is the function of the cochlea?  1. generates nerve impulses to be sent to the brain  - Name a disorder of the ear, its cause, symptoms and treatment  1. Disorder = Glue ear  Cause = Excess sticky fluid in the middle ear  Symptom = Some degree of deafness  Treatment = In mild cases drops are used, in severe cases grommets are used