BSCI 1511 Chapter Notes - Chapter 50: Endoplasmic Reticulum, Hemoglobin, Chitin

• School: Vanderbilt University
• Department: Biological Sciences
• Course: BSCI 1511
• Professor: Johnson Carl

Document Summary

Sensory reception: detection of stimulus by sensory cells, sensory receptors open or close ion channels, this changes membrane potential (sensory transduction), the potential is receptor potential and varies with size of stimulus. A more intense stimulus causes more neurotransmitter to be released of increases frequency of action potentials. Some neurons fire without stimulus so a change in frequency is also indicative. Constructions formed in brain, color, smells, sounds. Action potentials travel along neurons that are specific to a stimulus, i. e. only sight or sound. Amplification: strengthening of sensory signal during transduction, a few photons give an image in the brain that has much more energy than the stimulus. Mechanoreceptors: sense physical deformation by pressure, touch, etc. Ion channels linked to structures like hairs that extend outside the cell, bending the structure generates tension that changes the ion channels (change in membrane potential)