Chemoreceptors sensitive to blood carbon dioxide levels are primarily located in the
A. jugular veins.
B. medulla oblongata.
C. right atrium.
D. carotid arteries.
E. left ventricle.
Answer: B
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The clavicles articulate with which portion of the sternum?
A) manubrium B) body C) xiphoid process D) sternal angle E) jugular notch
What is a muscle that provides the major force for producing a specific movement called?
A) a synergist B) an agonist C) an antagonist D) a fixator
____________________are local chemical messengers whose effect is exerted only on neighboring cells in the immediate environment of their site of secretion
Fill in the blank(s) with correct word
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.