Homeostasis of gas levels

Hyperventilation

• Lowers CO2 levels in the blood stream

• Increase CO2 levels in the blood stream

• Increase O2 levels in the bloodstream

• Is deep rapid breathing

When hydrogen levels increase

• pH levels decrease

• pH levels increase

• pH levels remain unchanged

• Blood becomes more alkaline

In which situation would O2 play a role in the regulation of breathing rate

• During exercise

• Hiking at altitude

• During hyperventilation

• During rest

The aortic and carotid bodies are classified as which type of chemoreceptor?

• Central

• Peripheral

Which nerve travels to the diaphragm during regulation of breathing rate and depth?

• Diaphragm nerve

• Vagus nerve

• Phrenic nerve

• Somatic nerve fibre

Which of the following statements is incorrect?

• CO2 combines with water to form carbonic acid

• Bicarbonate ions dissociate into Hydrogen ions and water

• Peripheral chemoreceptors are most sensitive to a change in pH (H+)

• Central chemoreceptors are most sensitive to a change in pH (H+)

What is the modulator for breathing rate?

• Respiratory centre in the medulla

• Respiratory centre in the hypothalamus

• Respiratory centre in the cerebral cortex

What part of the brain is responsible for voluntary control of breathing?

• Medulla oblongata

• Cerebellum

• Cerebrum

• Hypothalamus

Why can we not hold our breathe indefinitely?

• CO2 levels would build up

• O2 levels would decrease drastically

• We need oxygen to live

• We would become unconscious without oxygen.

Which of the following receptors (when stimulated) would cause the fastest response to changes in pH, H+ or CO2 levels?

• Peripheral

  Aortic and Carotid

• Central

  Medulla