respiratory system/step 8: respiratory control center

chemical regulation of respiration

-central chemoreceptor -peripheral chemoreceptor

central chemoreceptor

-located in medulla oblangata -monitors the pH and or PCo2 levels within CSF

repiratory control center

-located in medulla oblongata and pons -inspiratory area -expiratory area -chemical regulation or respiration

peripheral chemoreceptors

-located n walls of systemic arteries -monitor the PCo2, pH, and Po2 in blood; travels to the respiratory center via vagus and glossopharyngeal nerves

expiration area

-remains inactive during most norma, quit inspirations -during forced expiration, the inspiratory area activates the experatory area causing contraction of the internal intercostals and ab muscles -this decreases the size of thoracic cavity and causes forced expiration

inspiratory area

-sets the rhythem to intiate inspiration -nerve impulse from active area last 2 sec and reach diaphram causing muscle to contract adn inspiration occurs -at end of 2 sec muscle relaxes for 3 sec, then the cycle repeats