BIO 12 Lecture Notes - Lecture 16: Peripheral Nervous System, Sensory Neuron, Thermoreceptor
Document Summary
Afferent branch of peripheral nervous system (going to the brain) Perception: conscious interpretation of the world based on sensory systems, memory, and other neural processes. Information is sent from the periphery to the cns: external environment (sensory, internal environment (visceral afferent) Sensory systems: somatic: sensations of the skin, proprioception: perception of limb and body position in space, special senses (vision, hearing, taste, smell) Detect specific form of energy in the external environment. Change shape when specific energy is received. Thermoreceptors are most sensitive to temperature but can respond to. Law of specific nerve energies: a given sensory receptor is specific for each modality pressure. Sensory transduction conversion of stimulus energy (ex. Receptor or generator potentials (psp: graded potentials, opening or closing of ion channels, triggered by sensory stimuli (ex. If the receptor potential exceeds threshold, it can generate an action potential and it reaches the cns. Sensory receptor fires an action potential that is carried to the cns.
