Examlex
What is the muscle under autonomic control that regulates the diameter of the pupil?
Ion Channel-linked Receptor
A type of membrane receptor that can open or close an ion channel in response to the binding of a signaling molecule, thus affecting cell function.
Nicotinic Acetylcholine Receptor
A type of receptor found in the nervous system that responds to the neurotransmitter acetylcholine, playing a key role in muscle contraction and many other physiological functions.
Upregulation
The process of increasing the quantity or activity of a molecular component, often referring to gene expression or protein levels in cell biology.
Downregulation
The process by which a cell decreases the quantity of a cellular component, such as RNA or protein, in response to an external variable.
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