BIOA02H3 Lecture 14: Lec14 - The Nervous System.doc

• School: UTSC
• Department: Biological Sciences
• Course: BIOA02H3
• Professor: Mary Olaveson

Document Summary

Slide two functions of the nervous system: beginning stimulus final effect, reception. Slide three reception: sensory systems: to cause an effect, there must first be a sensory stimuli, diverse array of sensory system, used to monitor internal and external environments, some are complex but many are simple. Range from single cells to complex sense organs: examples of stimulus receptors, sent through a signal transduction pathway opening of ion channels. Chemical stimulus: odour molecules in environment, oxygen / carbon dioxide levels in blood. Pressure stimulus: mechanical receptor, pressing on body from outside, blood pressure being sent. Slide four reception and transmission: two general ways to transmit senses to the brain, sensing cells themselves can generate a signal directly to the brain. I. e. increase in membrane potential: electrical charge that exists across the cell membrane, cell is negative on the inside relative to the outside, depolarization refers to negative charge moving to the positive direction.