The Exchange and Transport of Gases Flashcards
what is the part of the brain that controls the breathing
medulla oblongata
what is the nervous system that controls the breathing
autonomic nervous system
what is inhalation
taking air into the lungs
what is the stimulus for inhalation
high CO2 content and H+
what registers the stimulus for inhalation
chemoreceptors
what nerve stimulates the diaphragm
the phrenic nerve
what nerve stimulates the muscles in the rib cage
intercostal nerve
what happens after the nerves stimulate the diaphragm and intercostal musfcles
the chest cavity increases and air rushes that
what is the normal breathing rate
12-14 bpm
how does exhalation work
Stretch receptors in lungs tell medulla oblongata that inhalation has occurred and the nerves de activate causing the muscles to contract which reduces the thoracic cavity in size and forces air out
what is hyperventilating and what does the brain perceive this as
excessive or over breathing that the brain perceives as a slow or stop signal which can cause you to pass out
what does drug poisoning due
it decreases sensitivy of chemoreceptors and brain stem therefore decreasing breathing rate
where does the exchange of oxygen and carbon dioxide take place
between the lung alveoli and the lung capillaries
what happens to ixygen and carbon dioxide when they are in the capillaries
they are dissolved in blood
what state is oxygen and carbon dioxide in when in the alveoli
gaseous state
