BIOL 1201 Chapter : Chapter 45
Document Summary
Hormones reach everywhere, but only target cells have receptors and respond: when secreted into the blood they reach everywhere and they go everywhere but the only cells that respond to it are the cells that have that receptor. Endocrine system = hormone responses = endocrine signaling. Low speed system and long acting=endocrine: reproduction, growth, behavior. Nervous system = high speed: acts very fast. Paracrine signaling = local regulators: through the extracellular matrix. Autocrine signaling: target = secreting: cell type secretes a hormone or other activator that affects itself or others around it, through the extracellular matrix. Synaptic/neuroendocrine signaling: one cell that is releasing cell molecules that the other cell picks up. Neurohormones (neurosecretory cells, through the bloodstream: act like hormone cells, but are nerve cells, they go all over the place but act with only the cells with the right receptor. Inter-individual, through the environment (esp. insects: mostly demonstrated in insects, acts outside the body.