BIOL 3402 Lecture Notes - Lecture 1: Mechanoreceptor, Blood Pressure, Brainstem
Document Summary
Personality and intellectual function: deprivation can cause hallucinations. Some input picked up, some doesn"t come to our conscious attention: blood pressure, temperature, muscle tension. Touch (tactile: temperature (heat, pressure (movement, pain: mechanoreceptors. Some true sense organs : nerve tissue, accessory tissues: epithelium, muscle, or connective. Transduction: one energy to another: changing light or heat to nerve signals. Receptor potentials: small local electrical change on a receptor cell by a stimulus: release action potential that generates nerve signals. Sensation: subjective awareness of stimulus: most produce no conscious sense ph or temperature, filtered in the brainstem. Gets slower over time: phasic receptors: adapt rapidly. Smell, hair movement: tonic receptors: adapt slowly. Proprioceptors: body position, muscle tension & joint motion. Modality: thermoreceptors, photoreceptors, nociceptors, chemoreceptors, mechanoreceptors. Origin of stimuli: externoreceptors: detect external stimuli, internoreceptors: detect internal stimuli, proprioreceptors: body position. Distribution: general: widely distributed, special: limited to head.
