Gas Exchange IV - Mechanism of Ventilation 3

Where do the pleural membranes of the lung meet?

What is the pressure within this closed pleural space w.r.t atmospheric pressure?

How does the Pulmonary Circulation run w.r.t the Systemic Circulation?

Describe Pulmonary Circulation

Describe Systemic Circulation

What is the pressure like in Pulmonary Circulation? What does this facilitate?

How do the Pulmonary arteries assist in Mx?

Show an equation that allows us to formulate Vascular Resistance

How does gravity influence ventilation and perfusion in humans?

How do alveoli differ depending on the region of the lung?

What is VA?

What is Q?

Why does regional VA:Q vary across the lung?

Why is regional mapping necessary?

How does regional VA:Q vary?

What occurs at 0?

What happens at infinity?

Why is local matching important?

What is modulated for VA:Q matching?

What effect does low PO2 have on blood flow?

How does vasoconstriction halt blood flow?

Why is blood flow restricted from accessing these areas of the lung?

How do fish maximise Gx?

How do bird lungs maximise Gx?

Show the efficacy of Gx of fish mammals and birds

Diagram of alveolus

Describe movement of air through an alveolus

How is transfer of O2 further influenced?

How fast is this transfer of O2?

What is Hb?

Describe Hb-O2 dissociation curve

What is meant by deoxygenated blood?

Describe the Bohr Shift

What other factors also cause an increase in O2 dissociation? (3)

Name 3 respiratory pigments and their characteristics

How does myoglobin function as an O2 reserve?

What is meant by P50 on an oxygen dissociation curve?

How does foetal Hb differ from maternal Hb?

Why is this important?

Draw a diagram showing O2 and CO2 exchange with the circulatory system and tissues of the body

carbonic anhydrase

How do CO2 levels alter pH of the cell?

Haldone effect