11.4 Transport Of Gasses And Control

Question 1

Air is a

Answer 1

Mixture of gasses (partial pressure aka ratio of each component)

Question 2

Oxygen transport

Answer 2

Bound to hemoglobin within erythrocytes (iron containing protein)

Question 3

Carbon dioxide transport

Answer 3

• some bound to hemoglobin (5-10%
• some dissolved in plasma (5-10%)
• majority (70-80%) becomes bicarbonate ion once it hits bloods plasma. CO2+H20 <-> HCO3- + H+

Question 4

Alveolar air has

Answer 4

Higher partial pressure of Oxygen (and lower pCO2) than the capillary

Question 5

Tissues have ____ pO2 and ____ pCO2 compared to Capillary

Answer 5

Lower, higher

Question 6

Hemoglobin affinity for O2

Answer 6

Varies under certain conditions (only lets go of O2 if a tissue needs it)

When O2 sat is high, hemoglobin affinity is high, and vice versa

Question 7

Hemoglobin decrease affinity factors

Answer 7

• increase carbon dioxide (burning fuels) CO2 binds and causes release O2
• Low pH (acidic), protons affect hemoglobin release O2
• increase temperature

Question 8

Hemoglobin increase affinity factors

Answer 8

• Carbon Monoxide bound (higher affinity)
• low CO2, high pH, decrease temp

Question 9

Control of pulm ventilation

Answer 9

CNS & PNS chemoreceptors (aorta and carotid) send info to Medulla Oblongata

Both effected by CO2, only PNS can be affected by O2

Question 10

Key driving factor of respiration

Answer 10

CO2

Question 11

Pulmonary ventilation adjusts

Answer 11

CO2 in blood, negative feedback for chemoreceptors

Question 12

Too much CO2 in blood

Answer 12

Respiratory disorders (prolonged CO2) Can lead to hypoxic drive.

Increase CO2 leads to Increase H2CO3
Which leads to acidic blood (low pH) called respiratory acidosis