Gas Exchange

0.0(0)
studied byStudied by 0 people
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/4

encourage image

There's no tags or description

Looks like no tags are added yet.

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

5 Terms

1
New cards

2 Places where gas exchange occurs

  1. External respiration: Alveoli

    O2 to blood, CO2 to lungs

  2. Internal respiration: Blood vessels (capillaries)

    CO2 to blood, O2 to tissues

2
New cards

Do gases travel down a concentration gradient?

No, gases travel down a pressure gradient, and each have their own partial pressure, not concentration

3
New cards

Dalton’s Law

Total air pressure is the sum of the partial pressures of each component gas added together.

4
New cards

Air pressure

Air pressure (total) at sea level = 760mmHg

  • pO2 = 160 mmHg

  • pCO2 = 0.3 mmHg

5
New cards

  1. O2 & CO2 is outside at normal air pressure

  2. Air travels through the conducting zones, becomes humidified and warmed up, mixes with the stale air (residual volume in lungs) and arrives at the alveoli.

  3. Venous blood in the veinules wrapping the alveoli, has a specific partial pressure to prompt O2 into the blood and CO2 out of the blood

  4. Pressure of the blood changes as it becomes arterial blood (same O2 & CO2 partial pressure as in the alveolus.

  5. Capillaries arrive at tissue sites and gas exchange occurs again, has a specific partial pressure to prompt CO2 into the blood and O2 into the tissues.

  6. The deoxygenated blood that enters the capillaries has the same pressure as the venous blood.