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The most rapid intracellular responses to signals result from activation of receptors that are also...
The ion that controls the widest variet of intracellular activities is
Signal molecules that degrade most rapidly, resulting in very brief effects, are
gases such as nitric oxide
The neurotransmitter norepinephrine ____
causes some blood vessels to dilate and others to constrict, because different vessels have different receptors for norepinephrine.
Compared to endocrine reflexes, neural reflexes ______
respond rapidly but are very brief
Cells that respond to signals are usually called
Why do some normal cells fail to respond to a chemical signal?
some cells lack the necessary receptors.
Receptor molecules are located in the:
- outer cell membrane
Lipophilic hormones bind to receptors
inside the cytoplasm or nucleus
changes the regulation of ion channels
increases intracellular Ca+ concentration
changes enzyme activity
Evaluates incoming signals and compares it with the setpoint
Stabilizes the variable being regulated
membrane-spanning proteins that communicate in gap junctions
A chemical that is secreted by a cell to act on cells in its immediate vicinity is called a
If the signal molecule acts on the cell that secreted it, the chemical is called an
target cell inserts more receptors into its membrane
Signal molecule receptors exhibit