Chemoreceptor Reflex

Central chemoreceptors are located in the ________.

medulla

Peripheral chemoreceptors are located in the arch of the _____ and near the baroreceptors in the ______ ______.

aorta, carotid sinus

Central chemoreceptors are stimulated by an ________ in PCO2 and a corresponding __________ in pH.

Increase, decrease

Peripheral chemoreceptors are stimulated by __________ pH (and indirectly, __________ PCO2)

decreasing, increasing

Peripheral chemoreceptors are also stimulated by a ___________ PO2

decreasing

Since the peripheral chemoreceptors are not close to the inspiratory areas, they use the sensory portion of ______ nerves to convey signals.

cranial

What cranial nerves do peripheral chemoreceptors use to convey signals to the higher brain centers?

Glossopharyngeal IX and Vegas X

Stimulation of the chemoreceptors produces stimulation of the _________ area in the medulla oblongata; this leads to an ________ in rate and depth of respiration.

inspiratory, increase

What are the stimuli in the chemoreceptor reflex?

1) Increase in blood PCO2 2) Decreasing pH 3) Decreasing PO2

What are the receptors of the chemoreceptor reflex?

Central and peripheral chemoreceptors

What is the control center of the chemoreceptor reflex?

inspiratory areas in the medulla

What are the effectors of the chemoreceptor reflex?

Muscles of inhalation and exhalation contract more forcefully and frequently

What is the response in the chemoreceptor reflex?

1) Decrease in blood PCO2 2) Increase in pH 3) Increase in PO2