PSL201Y1 Study Guide - Final Guide: Cardiac Arrhythmia, Resting Potential, Axon Hillock
Document Summary
Important in determining resting membrane potential (rmp) of cells. Rmp is critical for muscle, nerve, and cardiac function. Sources of acid-base disturbances ph homeostasis in the body. An action potential is triggered if the membrane potential at the axon hillock is depolarized to threshold; if the potential is below threshold, no action potential will occur. A single neuron communicates to several other neurons. A single neuron receives communication from several other neurons. The summing of an input from various synapses at the axon hillock of the postsynaptic neuron to determine whether the neuron will generate action potentials. The degree of depolarization of axon hillock is signaled by the frequency of action potentials. Enzyme for synthesis = choline acetyl transferase (cat) Smoking ~ arousal, alertness, learning and memory, etc. The effect is determined by the receptors and not the ligand. Amino acid neurotransmitters at excitatory synapses: aspartate, glutamate. Amino acid neurotransmitters at inhibitory synapses: glycine, gaba.
