Your friend is poking your skin with two pins a few millimeters apart at the same time. Visually, you can see there are two pins, but you can only feel a single pen poke. This is probably because:
A. the receptors in both skin areas utilize the same afferent neuron.
B. both pens are activating the same receptor.
C. both afferent neurons converge on the same interneuron.
D. both sensations are grouped together in the somatosensory cortex.
Answer: A
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Match the vitamin with its associated disease.A. ScurvyB. Night blindnessC. BeriberiD. PellagraE. Pernicious anemiaVitamin A
Fill in the blank(s) with the appropriate word(s).
Where is the deltoid?
a) C b) D c) F d) G e) I
Spinal nerves C5-T1 make up the ________ plexus.
A. sacral B. lumbar C. radial D. brachial E. cervical
Multiunit smooth muscle cells
A. generally have individual innervation of each cell. B. have many gap junctions between cells. C. respond to stretch by relaxing. D. can only be excited, and not inhibited. E. have abundant T-tubules.