All of the following provide chemoreceptor input to the respiratory centers of the medulla oblongata except the
A) olfactory epithelium.
B) medullary chemoreceptors.
C) aortic body.
D) carotid body.
E) central chemoreceptors.
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Question 2) The ciliary muscle contracts to
A) control the amount of light reaching the retina.
B) adjust the shape of the lens for distant vision.
C) adjust the shape of the lens for near vision.
D) control the production of aqueous humor.
E) adjust the shape of the cornea.
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Question 3) The apneustic centers of the pons
A) inhibit the pneumotaxic and inspiratory centers.
B) provide stimulation to the inspiratory center.
C) monitor blood gas levels.
D) alter chemoreceptor sensitivity.
E) generate the gasp reflex.
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Question 4) In the human eye, most refraction occurs when light passes through the
A) iris.
B) cornea.
C) lens.
D) aqueous humor.
E) vitreous humor.
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Question 5) The term hypercapnia refers to
A) the cessation of breathing.
B) elevated PCO2.
C) elevated PO2.
D) an increase in pH.
E) labored breathing.
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Question 6) The visible spectrum for humans extends between a wavelength of
A) 700 and 1000 nm.
B) 100 and 200 nm.
C) 200 and 400 nm.
D) 2000 and 2500 nm.
E) 400 and 700 nm.
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Question 7) A 10 percent increase in the level of carbon dioxide in the blood will
A) decrease the rate of breathing.
B) double the respiratory rate.
C) decrease pulmonary ventilation.
D) decrease the alveolar ventilation rate.
E) decrease the vital capacity.
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Question 8) Which of the following is not true regarding image formation?
A) The greatest amount of refraction occurs at the cornea.
B) The focal distance must equal the distance between the center of the lens and the retina to form a sharp image.
C) A round lens has a short focal distance.
D) Images arrive at the retina upside down and reversed.
E) To view a distant object the lens will become rounder.
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Question 9) The most important chemical regulator of respiration is
A) oxygen.
B) carbon dioxide.
C) bicarbonate ion.
D) sodium ion.
E) hemoglobin.
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Question 10) Light refraction takes place at the
A) cornea and lens.
B) lens only.
C) optic disc.
D) cornea and optic disc.
E) cornea only.
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