Which eye structure constricts or dilates to control the amount of light that enters the eye?
A) Iris
B) Pupil
C) Retina
D) Lens
Answer: A
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138) Excitatory neurotransmitters of the CNS usually act by opening ________ channels.
A) Ca2+ B) Cl- C) H+ D) K+ E) Na+
Umami is
A) the name of the ion channel activated by glutamate. B) another name for salty taste. C) a taste receptor cell activated by glutamate and nucleotides. D) a flavor enhancer that is part of olfaction.
All the following describe proper anatomical position EXCEPT the ________
A) eyes are straight ahead B) feet are facing forward C) palms of the hands are facing backward D) palms are the hands are facing forward
Malignant melanoma is a particularly dangerous form of skin cancer because ________
A) it may become aggressive, rapidly spread via the lymphatic system, and have a high mortality rate B) this type of cancer is most commonly localized to specific areas of the skin and rarely metastasizes C) exposure to UV rays from the sun cause the DNA in cells of the stratum basale to mutate D) slowly dividing melanocytes readily enter the lymphatic system