Examlex
In certain kinds of muscle cells, calcium ions are stored in ________.
Receptor Downregulation
A decrease in the number of receptors on the surface of target cells, often in response to high levels of a hormone or neurotransmitter.
Cyclic AMP
A second messenger important in many biological processes, involved in the activation of protein kinases and regulation of the effects of adrenaline and glucagon.
G Proteins
A family of proteins that act as molecular switches inside cells, involved in transmitting signals from stimuli outside the cell.
Upregulation
The process by which a cell increases the quantity of a cellular component, such as RNA or protein, in response to an external stimulus.
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