The recent discovery of taste receptors in the small intestine that detect sweetness
illustrates that
A) new discoveries about anatomy and physiology are still being made.
B) the molecular and cellular levels are of little interest in anatomy and physiology.
C) chemical responses occur in only one part of the body.
D) everything there is to know about anatomy and physiology has been discovered.
A
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Hallucinogenic drugs, such as LSD, function by
A) stimulating receptors for norepinephrine. B) blocking acetylcholine receptors. C) increasing the production of GABA. D) stimulating serotonin receptors. E) mimicking the action of dopamine.
Up-regulation of receptors
A) Results in increased sensitivity to its ligand. B) Results in decreased sensitivity to its ligand. C) Occurs when a ligand has been present at high levels. D) Both B and C
With positive feedback, a control system's input and output continue to enhance each other
Indicate whether the statement is true or false
In PNS nerve fiber regeneration, how is a growing axon directed to its original destination?
A. Injured Schwann cells produce a trail of prostaglandins to the original destination. B. It grows within a regeneration tube. C. The axonal terminals grow towards the neurosoma until the two severed fragments are reunited. D. The axon grows a collateral that is directed by growth factors secreted by the postsynaptic neuron.