How many signalling pathways are there for chemical intracellular communication?
2
3
4
Which are the 3 types of intracellular signalling pathways?
Autocrine Signalling Pathway
Exocrine Signalling Pathway
Paracrine Signalling Pathway
Neural Signalling Pathway
Endocrine Signalling Pathway
In the Autocrine Signalling Pathway: A cell and a chemical into the which then to the to generate a response, as seen in the .
In the Paracrine Signalling Pathway: A cell and a chemical into the , which then .
In the Endocrine Signalling Pathway: A cell and a chemical () into the or system which a very , throughout , before affecting the target cell.
Hormones are not as as neurotransmitters, they can to many cells to produce an or .
Hormones come in many forms which can be broken into 3 categories: formed from . formed from or . formed from the .
Peptide hormones are formed in the , before proceeding to the in which they may be . Once modified it travels into our blood or .
Because Blood and Lymph consist mainly of and Hormones are made from which are , they can in blood and lymph and therefore do not require a .
Hormones are not soluble so they can’t cross the of the target cell via .
Because peptide hormones can't into target cells, they bind to found on the to induce change. For example, opening a channel protein that can change or to travel into the cell to induce change.
Steroid Hormones are synthesised in the or the of cells.
are opposed to water soluble meaning they cant in the blood, so they require to reach their target.
can cross the cell membrane of the target cell via .
Steroid hormones bind to receptor proteins found in the of cells. The travels into the to induce change, triggering the synthesis of needed .
Derivative Hormones are synthesised by the or within the of cells.
Tyrosine Hormones can be either water soluble or . This means some don't require and induce change via on the which they cannot cross... whilst others do require and cross the membrane to induce within the of a cell.
