Which of the following statements regarding vitreous humor is correct?
A) Vitreous humor is a jelly-like substance that is replenished if lost.
B) Vitreous humor fills the posterior chamber and maintains the shape of the globe.
C) Vitreous humor is a clear watery fluid that fills the anterior chamber.
D) The most significant risk caused by a loss of vitreous humor is infection
Answer: B) Vitreous humor fills the posterior chamber and maintains the shape of the globe.
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What condition occurs when the lens of the eye loses elasticity and can no longer assume the spherical shape required to accommodate for near vision?
a. myopia b. optomia c. macular degeneration d. cataracts e. presbyopia
Thyroid-stimulating immunoglobulin stimulates both the secretion and growth of the thyroid similar to TSH
Indicate whether the statement is true or false
Which of these is most responsible for "light adaptation"-the process by which we only gradually become able to see objects in a brightly lit place after being in the dark?
A. Cone receptors are very hyperpolarized in the dark, and they must be exposed to bright light for awhile before they will depolarize. B. Rhodopsin is quickly inactivated in the presence of bright light so rods become unresponsive, and the higher-acuity cones then become the main detectors of vision. C. Cones and rods are stimulated equally, leading to difficulties in interpreting the sensory inputs to the brain. D. Because rods are more sensitive to light than cones, they gradually become extremely activated in bright light. E. Rhodopsin is not activated by colored light, and the lack of stimulation causes rods to gradually depolarize when we are exposed to bright light.
When a person develops a sore throat, white blood cells are drawn to the area of infection by a process called
A. chemotaxis. B. diapedesis. C. margination. D. ameboid movement. E. attraction.