Toisiolähettejä
Toisiolähettejä, also known as secondary messengers, are molecules within a cell that relay signals received from external sources. These external signals, often hormones or neurotransmitters, cannot directly cross the cell membrane. Instead, they bind to receptors on the cell surface, initiating a cascade of events within the cell. This cascade involves the activation or deactivation of toisiolähettejä.
Common examples of toisiolähettejä include cyclic AMP (cAMP), cyclic GMP (cGMP), calcium ions (Ca²⁺), inositol trisphosphate
The role of toisiolähettejä is crucial for cellular communication and regulation. They allow cells to respond