Examlex
Which tissue is in direct contact with the external environment of an animal?
Passive Transport
Membrane-crossing mechanism that requires no energy input.
Facilitated Diffusion
A process of passive transport, with the aid of integral membrane proteins, allowing substances to move across cell membranes without energy expenditure.
Receptor-Mediated Endocytosis
A cellular process by which cells internalize molecules (like hormones, nutrients, and proteins) by the inward budding of plasma membrane vesicles containing proteins with receptor sites specific to the molecules being internalized.
Allosteric Regulation
The regulation of an enzyme's activity through the binding of a molecule at a site other than the enzyme's active site, causing a change in its shape.
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