Chap 15: CNS MadeUPof brainspinalcord Processessend out instructions to thebody Controlcenter PNS Includes all nerves outside the CNS Sends sensory info to theCNS CNSwould tell PNSwhat todoand thePNS would tell U muscles todo that Afferentdivision carriessignalstotheCNSfromthebody touchingsmthnot Sensory Efferentdivision Cnswouldprocessthatintoandtellurmusclestodosmth movingurhand Motor ANS Controls involuntaryactions Shit u cantcontrol EXHeartrate digestion goosebumps breathing sympathetic system Fight or Flight Parasympathetic system Rest digest somatic SNS Controlsvoluntarymovements Shit vdocontrol Ex walking talking Chewinggumreflexes Visceral vs Somatic Visceral Manages internalorgans Somatic manages muscles bodymovements ExtL ingweights Somaticsensoryinfogoes tosensoryprocessing centers in thecerebralcortex visceral sensory info goes primarily to the brainstemand diencephalonReceptors: 7 Q's on the exam abt receptors 1. Phasic Receptors: Detect changes in stimulus intensity. Adapt quickly, signaling only changes (like touch that fades after a moment). 2. Tonic Receptors: Maintain a constant response to a sustained stimulus. Adapt slowly, providing continuous information (like pain or body position). 3. Isotonic Receptors: Refers to muscle contractions where muscle length changes with constant tension. 4. Nociceptors: Pain receptors that detect harmful stimuli, alerting the body to potential injury. 5. Baroreceptors: Detect changes in pressure, especially in blood vessels, to help regulate blood pressure. 6. Chemoreceptors: Respond to changes in chemical composition, like levels of oxygen, carbon dioxide, or pH in the blood. 7. Thermoreceptors: Detect temperature changes (hot or cold) on the skin or within the body. 8. Mechanoreceptors: Sense physical deformation like pressure, touch, vibration, or stretch. • Tactile Receptors: Detect touch, pressure, and vibration on the skin. • Baroreceptors: A subtype detecting pressure changes in blood vessels. • Proprioceptors: Sense body position and movement, helping with balance and coordination. 9. Exteroceptors: Detect external stimuli (e.g., temperature, touch, smell) from outside the body. 10. Interoceptors: Monitor internal conditions (e.g., blood pressure, internal pain). 11. Slow-Adapting Receptors: Maintain consistent signaling for prolonged stimuli, often related to pain. 12. Fast-Adapting Receptors: Respond quickly to changes, like smell, adapting rapidly to continuous stimuli. smellgoesdirectlytothebrainoneofthefastest recept1. Homunculus (Motor