BIO E121 Lecture Notes - Lecture 27: Multiple Sclerosis, Myelin, Resting Potential
Document Summary
Disease in the myelin sheath in the brain & spinal cord are destroyed. Results from the destruction of the myelin sheath that surrounds axons in the. Hardened scars, scleroses, interfere with the transmission of nerve impulses. Can result in paralysis & loss of sensation, including loss of vision. Lacks atp lacks informational transmission effected nerves; not acting accordingly; no fluid type of motion causing it to be jittery. A nerve impulse, or action potential, is an electrochemical signal that involves sodium & potassium ions (na+ & k+) that crosses the cell membrane through ion channels. Each ion channel is designed to allow only certain ions to pass through. Ion channels may be permanently open or regulated by a gate. A protein that changes shapes and opens/closes a channel. No energy required as ions follows gradient of concentration. Ions are transported across the membrane by sodium-potassium pumps.
