Which organ is unique in that it appears to be static tissue?
A. Heart
B. Brain
C. Lungs
D. Kidney
Answer: B
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Exciting a particular bipolar cell in the retina produces a green sensation. According to the opponent-process theory, what sensation comes from inhibiting that cell?
a. Yellow b. Red c. Blue d. Black
Research on the use of cell phones while driving indicates that
a. the negative effect can be decreased by using "hands-free" units. b. the problem with cell phones is that attention is distracted from the task of driving by the need to hold the phone and drive with one hand. c. the main effect of cell phone use on driving safety can be attributed to the fact that attention is used up by the cognitive task of talking on the phone. d. the public perception that using a cell phone while driving poses a significant risk to drivers' safety is, in fact, incorrect.
Answer the following statements true (T) or false (F)
1. When you walk into a dark movie theatre, you depend on the cones in your retina to help you find your way to an empty seat. 2. The axons of retinal ganglion cells form the optic nerve. 3. There are more rods than there are cones in the retina. 4. The blind spot is an area of the retina that lacks both rods 5. Visual acuity is best when light is projected onto the optic nerve.
From a global perspective, which of the following is the most common teratogen to affect pregnancies?
a. lead b. malnutrition c. alcohol d. rubella