BIOL 261 Lecture Notes - Lecture 14: Pulmonary Pleurae, Cellular Respiration, Aortic Body
Document Summary
19. 4 control of breathing: respiratory areas: groups of neutrons in the brainstem that control breathing depth and rate. Respiratory center of the medulla: ventral respiratory: control the basic rhythm of breathing. Peripheral chemoreceptors: primarily sense changes in the blood po2 in specialized structures called the carotid bodies and aortic bodies, they monitor oxygen that will reach the brain and the rest of the body; decreased. P02 sends impulse to the respiratory center breathing rate and tidal volume rise: only plays a major when po2 decreases to about 50% of normal. Important when ph of the blood changes but co2 does not. Stretch receptors in visceral pleura, bronchioles, and alveoli. Hg it enters the systemic capillaries with a lower p02: factors that increases diffusion, more surface area, shorter distance, greater solubility of gases, steeper partial pressure gradient. Increasing the blood level of carbon dioxide (pco2) Anemic hypoxia diminished ability of the blood to transport o2.
