Introduction to respiratory system Flashcards
What functions does the respiratory system have within the body?
- Contributes to acid-base balance
- Provides specialized surface where gas exchange takes place
Steps in ways oxygen gets from the atmosphere to cells
1) O2 inhaled from atmosphere into alveoli within lungs
2) O2 diffuses from alveoli into blood within pulmonary capillaries.
3) O2 transported in blood, predominantly bound to haemoglobin.
4) O2 diffuses into cells/tissues for use in aerobic respiration.
5) CO2 diffuses from respiring tissues to blood β exchanged at lungs.
What is required for efficient gas exchange?
An adequate concentration gradient between alveolar air and blood is required for efficient gas exchange (diffusion)
Boyles law
πβπ/π
if n constant, increase in volume will decrease pressure
How do gas molecules move to re-establish a constant pressure?
the appropriate number of gas molecules will move down the pressure gradient to re-establish a constant pressure
If the volume of one container is decreased, what happens to the pressure and movement of gas molecules?
If the volume of one container is decreased, this will momentarily increase the pressure in that space causing movement of gas molecules down the newly established pressure gradient, until a constant pressure is re-established.
If the volume of one container is increased, what happens to the pressure and movement of gas molecules?
If the volume of one container is increased, this will momentarily decrease the pressure causing movement of gas molecules down the newly established pressure gradient, until a constant pressure is re-established.
What do gases in air behave according to?
Behave in accordance with their partial pressure rather than pressure
Total pressure equation
ππππ‘ππ=π(π»2π)+βπ(πΆπππ π‘ππ‘π’πππ‘ πππ ππ )
P(Constituent gases)
ππππ =(ππππππππ‘πππβπ(π»2π)Γππππ
