Which of the following best explains how the phenomenon of "tolerance" develops with use of psychoactive drugs over time?
A. Psychoactive drugs can alter blood flow to the brain.
B. Psychoactive drugs often produce euphoria.
C. Psychoactive drugs can cross the blood-brain barrier.
D. Psychoactive drugs can inhibit production of endogenous neurotransmitters.
E. Psychoactive drugs can up-regulate receptors for endogenous neurotransmitters.
D
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Which tarsal bone articulates with the anterior surface of the talus?
A. Calcaneus B. Medial cuneiform C. Metatarsal I D. Cuboid E. Navicular
Which type of receptor initiates the inhalation (or Hering-Breuer) reflex?
A. Central chemoreceptors B. Baroreceptors C. Peripheral chemoreceptors D. Proprioceptors
Prior to assisting a cow with delivery, the attendant should wash the cow's ________________________________________ and wear shoulder-length plastic ________________________________________
Fill in the blank(s) with correct word
Why are calcium ions necessary for skeletal muscle contraction?
A) Calcium ions increase the speed of the action potential transmitted along the sarcolemma. B) Calcium ions release the inhibition on Z discs. C) Calcium ions trigger the binding of myosin heads to actin filaments. D) Calcium ions cause ATP binding to actin. E) Calcium ions bind to regulatory proteins on the myosin filaments, changing both their shape and their position on the thick filaments.