When a tissue's blood supply is blocked, carbon dioxide levels decrease in the deprived tissue.
a. True
b. False
Indicate whether the statement is true or false
(
Question 2) What condition is caused by uneven curvatures in the lens?
a. astigmatism
b. myopia
c. presbyopia
d. hyperopia
e. none of these
(
Question 3) The systolic pressure is the peak pressure exerted in the arteries when blood is pumped into them during ventricular systole.
a. True
b. False
Indicate whether the statement is true or false
(
Question 4) Emmetropia is characterized by
a. the lack of a particular cone type
b. pronounced visual difficulty in the early teenage years
c. a reduction in accommodative ability as a result of a loss of lens elasticity
d. excessive refractive power in the lens system of the eye
e. none of the above
(
Question 5) At resting heart rate, about 80 of the cardiac cycle is spent in systole and 20 in diastole.
a. True
b. False
Indicate whether the statement is true or false
(
Question 6) Vitamin A deficiency causes
a. poor night vision
b. poor color vision
c. color blindness
d. presbyopia
e. both a and d
(
Question 7) During systole, no blood enters the arteries, while blood continues to leave, driven by elastic recoil.
a. True
b. False
Indicate whether the statement is true or false
(
Question 8) Color vision
a. is perceived in the optic chiasma but is interpreted in the primary visual cortex
b. depends on various ratios of stimulation of the three cone types in response to different wavelengths of light
c. is usually lost in vitamin A deficiency
d. depends on activation of a specific cone for each visible color
e. is made possible by convergence within the cone pathways
(
Question 9) Although ventricular pressure falls to 0 mm Hg during diastole, arterial pressure does not fall to 0 mm Hg because the next cardiac contraction refills the arteries before all the blood drains off.
a. True
b. False
Indicate whether the statement is true or false
(
Question 10) Which one of the following is an anterior specialization of the choroid layer?
a. aqueous humor
b. ciliary body
c. cornea
d. lens
e. retina
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