What movements are made possible by the rotation of the head of the radius?
A) rotation and circumduction
B) adduction and abduction
C) pronation and supination
D) flexion and extension
E) rotation and adduction
Answer: C
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Extracellular messengers binding on surface receptors may exert effects on cells via all the following means, except:
a. opening gated channels. b. opening a gated channel through activation of a G protein. c. activation of the adenylyl cyclase system. d. binding to sites and then being endocytized. e. ultimately activating protein kinases.
Increasing blood concentrations of carbon dioxide and hydrogen ions have similar effects
upon the respiratory areas due to A) both increasing pH and inhibiting the respiratory areas. B) their similarity in chemical structure, inhibiting the respiratory rate. C) an increase in carbon dioxide, increasing hydrogen ions. D) both chemically bonding, decreasing the respiratory rate.
One function of the brain's frontal lobe is
A. speech interpretation. B. hearing. C. smell. D. verbal communication. E. vision.
Which of the following bones supports some of the weight of the brain?
A) ethmoid bone B) parietal bones C) frontal bones D) lacrimal bones E) zygomatic bones