CH387 Lesson 27: Respiratory 4

A decrease in PCO2 causes __________ of the bronchioles and __________ of the pulmonary arterioles.

What area in the brain sets the respiratory rhythm?

Inspiratory neurons send information to the diaphragm via what nerve?

What directly stimulates the central chemoreceptors, thus increasing respiration?

As a result of hyperventilation, what will happen to the partial pressures of CO2 (pCO2) and pH?

Which receptors inhibit inspiration during hyperinflation of the lungs?

What stimulates increased respiration at the beginning of exercise?

A homeostatic control mechanism controls respiration. What acts as the effector(s) in this system?

How should the respiratory system respond to a low blood pH level?

In the model for quiet breathing, expiration is induced by

During active breathing, bursts of action potentials are observed to occur

When the blood becomes ________, it can lead to a depression in the activity of the central nervous system.

During quiet breathing, a person's breathing cycle consists of

Peripheral chemoreceptors respond to all EXCEPT which of the following?

Central chemoreceptors are neurons in the medulla that respond directly to changes in

Chemoreceptors respond primarily to changes in PCO2 indirectly by its effect on

Hyperventilation will cause changes in PCO2 that are detected by the chemoreceptors which causes a(n)

Which of the following best describes a chemoreceptor response to PO2?

The chemoreceptor reflex regulates ventilation primarily through sensing changes in blood PO2.

A local bronchodilation within the alveolus will result in a(n) ________ in the ventilation-perfusion ratio in that region. A vasoconstriction of pulmonary arteriole diameter will result in a(n) ________ in the ventilation-perfusion ratio in that region.

The resistance of the airways is controlled by bronchioles that are sensitive to changes in PCO2.

The primary effect of increased PO2 in the lungs is to cause ________ which ________ the ventilation-perfusion ratio back to a normal level.

The primary effect of increased PCO2 in the lungs is to cause ________ which ________ the ventilation-perfusion ratio back to a normal level.

What is the normal pH range for blood?

Which statement best describes the effect on the body due to pH changes either above or below the normal range?

How does hemoglobin (Hb) act as a blood buffer?

If the peripheral chemoreceptors were damaged, a person would not display respiratory symptoms or dysregulation because the central chemoreceptors would still be in place and would effectively take over moment-to-moment regulation of ventilation.

The central pattern generator (GPG) __________.

Why is blood in the pulmonary artery called mixed venous blood?