BISC 104Lxg Lecture 10: BISC 104 Notes - Action Potential
11 Feb 2017
School
Department
Course
Professor
Document Summary
Nerve impulses begin at the swollen base of the axon and move toward the axon terminus (in a wavelike motion) where they release neurotransmitters. Propagation speed can be influenced by the diameter of the axon (large axons propagate faster) and the amount of myelin on the axon. Myelin are lipids and phospholipids found wrapped across neural processes that aid in faster transmission. A disease in which the myelin sheaths in the brain and spinal cord are progressively destroyed. Results from the destruction of the myelin sheath that surrounds axons in the cns. The resulting scars, scleroses, interfere with the transmission of nerve impulses. Can result in paralysis and loss of sensation, including loss of vision. Communication between a neuron and an adjacent cell occurs by neurotransmitters. Synapse is a junction between a neuron and another cell. In the case of two neurons, the presynaptic neuron sends a message to the postsynaptic neuron.
