Which of the following structures is responsible for refracting light rays?
A) pupil
B) lens
C) iris
D) cornea
D
Explanation: The cornea actually bends, or refracts, the light rays. The pupil admits the proper amount of light. The lens focuses incoming light onto the retina. The iris controls the size of the pupil.
You might also like to view...
Which of the following statements about ultraviolet radiation is TRUE?
A. It's best to avoid outdoor activity in the late afternoon because the sun's rays are most intense after 3 p.m. B. Swimming is a good choice of outdoor activity because ultraviolet rays cannot penetrate water. C. Sand doesn't reflect ultraviolet radiation, so beach-goers need to wear sunscreen even if they sit under a beach umbrella. D. You need to wear sunscreen when outdoors at high elevations, because the atmosphere at high altitude filters out most ultraviolet radiation.
Schools should identify ways to work with nonprofit health agencies within the community.
Answer the following statement true (T) or false (F)
The most serious form of skin cancer is squamous cell cancer.
Answer the following statement true (T) or false (F)
Bone is a specialized type of loose connective tissue consisting of contractile cells.
Answer the following statement true (T) or false (F)