B4.5 Flashcards
Q: What happens when you breathe in regarding oxygen?
Oxygen-rich air moves into your lungs
Maintains a steep concentration gradient with the blood
Oxygen continually diffuses into the bloodstream through alveoli
Q: How does breathing out affect carbon dioxide?
Removes carbon dioxide-rich air from the lungs
Maintains a concentration gradient
Allows carbon dioxide to continually diffuse out of the bloodstream into the air in the lungs
Q: What is the role of the ribs when you breathe in?
Ribs move up and out
Q: How does the diaphragm move when you breathe in?
The diaphragm flattens
Q: What happens to the volume of the chest when you breathe in?
The volume of the chest increases
Q: How does an increased chest volume affect chest pressure when you breathe in?
Increased volume means lower pressure in the chest
Q: How does atmospheric pressure compare to chest pressure when you breathe in?
Atmospheric air is at a higher pressure than the chest
Q: What causes air to be drawn into the lungs when you breathe in?
Higher atmospheric pressure compared to lower chest pressure
Q: What happens to the ribs when you breathe out?
Ribs fall
Q: How does the diaphragm move when you breathe out?
The diaphragm moves up
Q: What happens to the volume of the chest when you breathe out?
The volume of the chest gets smaller
Q: How does a decreased chest volume affect chest pressure when you breathe out?
Decreased volume means increased pressure in the chest
Q: How does chest pressure compare to outside pressure when you breathe out?
Pressure in the chest is higher than outside
Q: What causes air to be forced out of the lungs when you breathe out?
Higher chest pressure compared to lower outside pressure
Q: What maintains the concentration gradient for oxygen in the lungs?
Continuous movement of oxygen-rich air into the lungs
