The embryonic disk is initially composed of ________.
A. epiblast and hypoblast
B. epiblast and yolk sac
C. ectoderm and hypoblast
D. hypoblast and yolk sac
E. epiblast and mesoderm
Answer: A
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We are constantly bombarded by a variety of stimuli inside and outside of our bodies. Why are we not overwhelmed by sensory information?
A) We do not have receptors for most stimuli. B) Stimuli are blocked from the receptors by our immune systems. C) Most stimuli are external to our bodies and we have very few exteroceptors on the outside of the body. D) A particular receptor type can have different sensitivities to different stimuli. E) A very tiny percentage of incoming sensory information is received by the cerebral cortex.
Deep pressure and vibration are detected by which of the following?
A. Ruffini corpuscles B. Free nerve endings C. Tactile (Meissner) corpuscles D. Lamellar (pacinian) corpuscles E. Krause end bulbs
In an adult male, the body consists of about ________ percent water
A) 60 B) 90 C) 40 D) 10 E) 80
Excess potassium ions are eliminated from the body by the
A) digestive system. B) spleen. C) sweat glands. D) liver. E) kidneys.