BIO271H1 Lecture 3: BIO271 2014 Lecture 3.pdf

• School: UTSG
• Department: Biology
• Course: BIO271H1
• Professor: Christopher Garside

Document Summary

Lecture 3: sensory physiology chemoreception. Causes depolarization called a generator potential. Receptor potential opens voltage gated calcium channels, causing the release of neurotransmitters onto the primary afferent neuron. For ex. smell and taste. Form the basis of smell and taste. Important in sensing components of the internal environment such as blood oxygen, and ph. Mechanoreceptors: pressure and movement stimulate mechanoreceptors. Mechanoreceptor in the skin, adequate stimulus is pressure. Many receptors can be excited by other stimuli as well as its adequate stimuli. Chemical activations, changes in temperature. Stimulus encoding all stimuli are ultimately converted into action potentials in a primary afferent neuron. Sensory receptors and sensory neurons must encode 4 types of information. Stimulus duration when the action potentials are coming from that sensory input. Stimulus modality and location receptor location encodes stimulus modality and location. Integrating center: spinal cord and brain. Modality: theory of labeled lines. Discrete pathway from sensory cell to integrating center.