Transport of respiratory gases

Option D6

Essential idea: Scientists have a role in informing the public - scientific research has lead to a change in public perception of smoking.

Understandings

D.4.U1 Oxygen dissociation curves show the affinity of hemoglobin for oxygen

Oxygen-hemoglobin dissociation curve explained

D.4.U2 Carbon dioxide is carried in solution and bound to hemoglobin in the blood

Diagram of how carbon dioxide is carried in the blood

D.4.U3 Carbon dioxide is transformed in red blood cells into hydrogencarbonate ions

Carbon dioxide change into hydrocarbonate ion
Carbon dioxide change into hydrocarbonate ion explained

D.4.U4 The Bohr shift explains the increased release of oxygen by hemoglobin in respiring cells

Bohr Shift diagram explained

D.4.U5 Chemoreceptors are sensitive to changes in blood pH

Function of peripheral chemoreceptors

D.4.U6 The rate of ventilation is controlled by the resiratory control center in the medulla oblongata

Respiratory control centre location and function

D.4.U6 During exercise the rate of ventilation changes in response to the amount of CO2 in the blood

Changes in ventilation during exercise calculated
Changes in ventilation during exercise explained

D.4.U6 Fetal hemoglobin is different from adult hemoglobin allowing the transfer of oxygen in the placenta onto the fetal hemoglobin

Differences between fetal and adult hemoglobin

Applications

D.6.A1 Consequences of high altitude on gas exchange

Partial pressure differences at sea level and altitude

What are the consequences of decreased alveolar PO2 on gas exchange at altitude?

Consequences of high altitude on gas exchange

D.4.A2 pH of Blood is regulated to stay within the narrow range of 7.35 to 7.45

How blood pH is regulated

D.4.A3 Causes and consequences of emphysema

Causes of emphysema

Causes of emphysema

Consequences of emphysema

Consequences of emphysema

Skills

D.4.S1 Analysis of dissociation curves for hemoglobin and myoglobin

Measurement of heart rate

Graph of difference between myoglobin and adult hemoglobin

Use graph above to make conclusions regarding myoglobin and adult hemoglobin

Show conclusions | Hide conclusions
Difference between myoglobin and adult hemoglobin explained

D.4.S2 Identification of pneumocytes, capillary endothelium cells and blood cells in light micrographs and electron micrographs of lung tissue

Different cell types making up the alveolus

Lung cells labelled

Identify the different cell types in the lung micrograph below

Place the mouse pointer on the micrograph to view the different cells

lung tissue labelled in a micrograph
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