Question

56. The peripheral chemoreceptors d. Are sensitive to low blood levels of CO e. Are considered the respiratory pacemaker a. Are chemoreceptors within the great arteries Are located in the superior and inferior vena cava Respond to very high arterial O2 levels b. c. 57. The respiratory role of the cerebral cortex... Is the pacemaker of the respiratory system Allows limited, conscious control Responds to high blood oxygen content All of the above d. a. b. e. c. Works by influencing chemoreceptors in the aorta

Answer 1

56. A

Peripheral chemoreceptors are carotid and aortic bodies. They are sensory extension in to blood vessel which detect changes in chemical concentration of blood. Peripheral chemoreceptors monitor concentrations of blood borne chemicals and maintain homeostasis in the cardiorespiratory system. Carotid body located on one of the main arteries of neck, while aortic body located on aortic arch.

57. B

The motor cortex of cerebral cortex controls voluntary respiration (conscious control). Different areas of cerebral cortex control various forms of voluntary respiration.