BIOL 121 Lecture Notes - Lecture 29: Central Chemoreceptors, Respiratory Center, Chemoreceptor
Document Summary
Receptors that respond to chemical changes in the composition of blood or other fluid: central chemoreceptors. Only detect changes in ph: peripheral chemoreceptors. Located in aortic arch and carotid sinus. Respiratory centers are not directly affected by co2, h+ and o2 in the blood. Chemoreceptors in the medulla detect the h+ ions and stimulate the respiratory center. Control through peripheral chemoreceptor system: responsive to decreased po2, increased pco2 and decreased ph. Components of the gastrointestinal tract: mouth - beginning point of digestion. Parotid gland secretes a watery liquid that contains salivary mucus. Submandibular gland secretes a thicker liquid that contains mucus and amylase. Sublingual gland secretes more mucus and less amylase. Mastification (chewing) mechanical manipulation of food into bolus. Peristalsis movement of bolus down the esophagus: coordinated contractions and relaxations of both longitudinal and circular muscle, controlled by medulla oblongata involuntary, secondary peristalsis initiated if food is lodged in the esophagus digestion. Contains a nervous plexus myenteric plexus.
