BIO 1140 Study Guide - Gtpase, Plasmodesma, Irs1
Document Summary
: released by one cell and affected by another cell. Hormones: chem messengers synthesized by endocrine cells that are released into the extracellular environment carried to a distance cell. e. g. in animals happens in blood, very important in multicellular organisms to integrate activities. Neurotransmitters & neurohormones: act on the cell next to the neuron, neurohormones are realeased to act at a distance. chem messenges released by neurons that tend to. Paracrine agent: released by the signalling cell and act on the neighbouring cells. The chemical messengers involved are adrenaline and norepinephrine that increases heart rate, act on liver to increase sugar levels, respiratory rate and sweat. Signalling molecule: first step which is excreted by the cell to act on target cells. Target cells have the appropriate receptor to recognize the signal (lock & key mechanism). Transduction: converting the signal into a cellular response. Located on the cell membrane, cytosol or nuclear areas.
