Light-sensitive cells in the retina are called:
a. iris
b. cornea
c. lens
d. photoreceptors
D
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In construct validation,
a. a single variable can serve as the criterion. b. multiple studies are not required. c. no single variable serves as the criterion. d. the criterion remains static once defined.
A hormone is a chemical that is ____
a. secreted by a gland to the outside world b. conveyed by the blood to other organs, whose activity it influences c. capable of activating or inhibiting muscle fibers d. a feedback message from the postsynaptic neuron to the presynaptic neuron
Herb is watching a documentary on Dr. Loewi. He learned that neuroscientists first understood that synapses use chemicals to communicate because Dr. Loewi _____.
A. decreased a dog's heart rate and then used adrenaline to speed it up B. stimulated a frog's heart that was in a fluid bath and then used just the fluid to simulate a second heart C. measured the reflex speeds in dogs D. applied adrenaline directly onto a heart muscle
In vertebrate retinas, receptors send their messages ____.
A. straight to the brain B. immediately to ganglion cells within the retina C. to bipolar cells within the retina D. to the periphery of the retina first, ganglion cells next, and bipolar cells last