WorksheetsCHAPTER 7 GASEOUS EXCHANGE SB025 BIOLOGY
Total questions: 18
Worksheet time: 36mins
Tick ANY relevant answers. The oxygen dissociation curve (ODC) shows that in lungs;
Hemoglobins are 98% saturated with oxygen
There are higher partial pressure of oxygen than partial pressure of carbon dioxide
Hemoglobin has higher affinity towards carbon dioxide than oxygen
Hemoglobin are saturated with oxygen
Tick ANY relevant answers. The ODC shows that in tissues during resting;
Hemoglobin is fully saturated with oxygen
There is a reduction of hemoglobin affinity towards oxygen
Oxygen dissociates from hemoglobin to the tissues
There is an increase of hemoglobin-oxygen saturation
Tick ANY relevant answers. The ODS shows that in tissues during exercise,
The partial pressure of oxygen is very low
There is a very robust dissociation of oxyhemoglobin to oxygen and hemoglobin
The percentage of oxygen saturation in hemoglobin is about 18%
It is shown by the steepest part of the curve
What can be concluded when the curve of ODC is displaced more to the right?
The less readily the hemoglobin to pick up oxygen
The more readily the hemoglobin to pick up oxygen
The easier the hemoglobin to release oxygen
The harder the hemoglobin to release oxygen
What can be concluded when the curve of ODC is displaced more to the left?
The less readily the hemoglobin to pick up oxygen
The more readily the hemoglobin to pick up oxygen
The easier the hemoglobin to release oxygen
The harder the hemoglobin to release oxygen
Based on the figure given, which curve represents ODC for myoglobin?
A
B
C
D
The ODC of myoglobin has (a) shape.
On the other hand, the ODC of hemoglobin has (a) shape.
What can be analysed from the ODC of myoglobin vs hemoglobin in term of the dissociation of oxyhemoglobin?
Only at very low partial pressure of oxygen that the oxygen will be released from myoglobin compared to hemoglobin
Only at very low partial pressure of oxygen that the oxygen will be released from hemoglobin compared to myoglobin
Based on the analysis of ODC of myoglobin vs hemoglobin, which pigment is more suitable to function as oxygen storage?
(a)
Based on the analysis of ODC of myoglobin vs hemoglobin, which pigment is more suitable to function as oxygen carrier and transporter?
(a)
Myoglobin is found in a large amount in the flight muscles of birds, Which of these correctly explains this biological finding?
Myoglobin can supply the energy needed while flying
Myoglobin can supply oxygen to the muscular tissues when the birds are flying in areas with low oxygen partial pressures
Compare to haemoglobin, myogoblin has a higher affinity for oxygen and can retain oxygen better in active muscles
Myogoblin has a smaller molecular size than haemoglobin
The partial pressure of carbon dioxide in leg muscle increases after a vigorous workout. Which of the following regulatory actions will occur to correct the above condition?
Chemoreceptors in the respiratory and cardiovascular centres in the brain are stimulated
The rate of heartbeat decreases
Arterioles in the leg muscles constrict
Diaphragm and intercostal muscle relax
Which of the following statements CORRECTLY explains the meaning of the Bohr effect?
The effect of the partial pressure of oxygen in blood on the affinity of haemoglobin towards carbon dioxide
The effect of the partial pressure of carbon dioxide on the dissociation of oxyhaemoglobin
The affinity of haemoglobin towards oxygen
The affinity of haemoglobin towards carbon dioxide
Increased level of carbon dioxide is
detected in blood by central chemoreceptors
detected by chemoreceptors and causes them to send impulses to expiratory centre
detected by chemoreceptors and causes them to send impulses to inspiratory centre
detected in cerebrospinal fluid by both central & peripheral chemoreceptors
Chemoreceptors that are sensitive to partial pressure of oxygen levels in the blood are located in the
aorta and carotid arteries
medulla oblongata
hypothalamus
spinal cord
When the lungs expand, the (a) receptors will be stimulated.
If expiratory centre received signal from the stretch receptors in alveoli, this will __________ the action of ________ centre.
inhibit ; inspiratory
inhibit ; expiratory
activate ; inspiratory
activate ; expiratory
