BIOL 2160 Chapter : Chapter 5 Chemical Messengers
Document Summary
Chapter 5 chemical messengers: mechanisms of intercellular communication, direct communication through gap junctions, indirect communication through chemical messengers. Released by cell, moves to target cell by diffusion. Histamines: released with tissue damage and causes dilation of blood vessels. Testosterone: moves form the leydig cells into the seminiferous tubules. Messengers of nervous system: released from neuron by exocytosis, diffuses to very close target cell across a synapse. Have to go through the blood stream: released from endocrine gland into blood, transported in blood to target. Target cell = cells in body with receptors specific to the hormone. Neurohormones: long distance transmittance: hormones released from the axons of neurons (in your brain) rather then a gland, adh & oxytocin in posterior pituitary (don"t worry about this, inhibiting & releasing hormones into the portal system into the anterior pituitary. Involved in cell development, differentiation, and immune response. Often act on a wide range of targets.
