MARKET 1 Lecture Notes - Lecture 13: Axon Hillock, Endoplasmic Reticulum, Neuroglia
Document Summary
Introduction to psychology 1: cognitive and biological psychology. Ion channels can be resting (open); voltage gated, ligand gated or mechanically gated. The intracellular and extracellular fluid contain different types of ions: sodium (na+, potassium (k+, chloride (cl-) Don"t move in or out the cell; fixed. Two forces determine the movement of ions into and out of the cell: concentration (high to low density), electrical (negative positive). Ion channels only allow specific ions to move through the neuronal membrane. Ion channels and the resting membrane potential: at rest, sodium ion channels are closed. Therefore, sodium is not free to move across the membrane: however, some potassium ion channels are open. The sodium (na+) potassium (k+) pump: at rest, a neuron has more positive ions outside the cell than inside the cell. The action potential: at rest, neuron is -ly charged (-65mv). Caused by more ions inside the cell than outside. The action potential is then propagated down the axon.
