PSB-2000 Study Guide - Midterm Guide: Striatum, Two-Streams Hypothesis, Delirium Tremens
Document Summary
The entering dorsal roots carry = sensory info to the brain. Soma lives in dorsal root ganglion (drg) Axon ends in skin and in spinal cord. Soma is in the ventral horn (gray matter). A segment of skin associated with a spinal nerve. Involuntary movement, stereotyped response to a sensory input. Norepinephrine released on heart increase heart rate. Acetylcholine released on heart decreases heart rate. Sodium (na+), potassium (k+), chloride (ci-), calcium (ca2+) 70mv is resting potential: understand the forces working on the ions. Concentration gradient: different levels of ions inside vs. outside. Ions flow from high areas of concentration to low concentration. Involves sodium (na+) and potassium (k+) moving through channels in axons membrane. Axon hillock depolarizes to -50mv, voltage sodium channel opens, and sodium rushes inside, the cell becomes depolarized. Sodium channels close, potassium rushes out of cell. The sodium inside cell diffuses to next node of ranvier.
