UH BIOL 1361 - Chemical Synapse and Hormones (6 pages)

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Chemical Synapse and Hormones

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Chemical Synapse and Hormones


The 24th lecture that finishes up the topic over neurons and begins the topic of hormones and signaling.

Lecture number:
Lecture Note
University of Houston
Biol 1361 - Intro to Biological Science

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BIOL 1361 1nd Edition Lecture 24 Outline of Last Lecture I Neuron Structure II Fig 37 2 III Real Neurons IV Resting Potential V Figure 37 6 VI Description of Ion Movement VII Electrochemical Equilibrium VIII Action Potential IX Graph Outline of Current Lecture I Synapse II At Chemical Synapse III Cell Communications and Hormones IV Hormones V Signaling Modes VI Pheromones VII Protein Secretion VIII Hormonal Regulation of Target Cells These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute IX Water Soluble hydrophilic Hormones X Signaling Pathway XI Figure 5 25 XII Signal Transduction Current Lecture I Synapse a Step 1 Axon goes down the axon b Step 2 The voltage gated Ca channel opens when the action potential arrives It enters the cell and attaches to the vesicles to make them fuse with the plasma membrane releasing the neurotransmitters c Step 3 The ligand gated Na channels open when the neurotransmitter attaches to them d Step 4 The Na K pump II At Chemical Synapse a The electrical signal crosses the synaptic clef gap between neurons b How i Action Potential reaches end of neuron ii Voltage changes in the neuron membrane iii Voltage gated Ca2 channels open iv Ca2 binds to vesicles containing neurotransmitter v Vesicles fuse with neuron membrane vi Neurotransmitter is released by exocytosis into the synaptic clef vii Neurotransmitter binds to receptors on next neuron viii Receptors are ligand gated Na channels Na channels that open when the right molecule ligand attaches 1 Ligand a small molecule that attaches to a receptor 2 Ligand is a general term ix Neurotransmitter detaches from receptors and is degraded by enzymes to stop signal III Why Do Cells Communicate a Unicellular Organisms i Food ii Safety iii Mates b Multicellular Organisms i Coordinate Activities IV Hormones a Def Chemical signals produced by endocrine cells i Endocrine cells secrete hormones into the

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