NOTES-Chapter 47

NOTES-Chapter 47 - Chapter 47 Chemical Signals in Animals...

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Chapter 47: Chemical Signals in Animals There are six categories of chemical signals o Autocrine signals-act on the same cell that secretes them o Paracrine Signals-diffuse locally and act on neighboring cells (insulin and glucagon) o Endocrine Signals-are hormones carried between cells by blood or other body fluids o Neural signals-diffuse a short distance between neurons o Neroendocrine signals- are released from neurons but are carried by blood or other body fluids and act on distant cells o Pheromones- are released into the environment and act on a different individual Horomone Signaling Pathways o Endocrine Pathway Stiumulus-endocrine cell-endocrine signal-effector cell-response Ex: acid, intestine, need to neutralize the acid using chemical secretin which goes into the blood which secretes bicarbonate to neutralize acid in the pancreas o Neuroendicrine pathway Stimulus-sensor cell- neural signal-cns- neuroendocrine signal- effector cell-response Ex: dehydration, hypothalamus releases hormone ADH which is an antidiuretic hormone which goes to the kidney and collective tubules with aquaporins. ADH opens aquaporins and kidney reabsorbs water o Neuroendocrine to endocrine pathway Stimulus, sensor cell, neural signal, cns, neuroendocrine signal, endocrine cell, endocrine signal, effector cell, response Ex: stress stimulates the endocrine signal CRH which is a releasing
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This note was uploaded on 04/07/2011 for the course BIOL 104 taught by Professor Bray-speth during the Fall '11 term at Saint Louis.

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NOTES-Chapter 47 - Chapter 47 Chemical Signals in Animals...

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