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WorksheetsSB025 TOPIC 17
Total questions: 15
Worksheet time: 11mins
Carbon dioxide is transported in the blood mainly
In solution
As carbonic acid
As hydrogencarbonate ions
As carbominoheamoglobin
The Bohr shift accur in regions of
Increased partial pressure of oxygen
Decreased partial pressure of oxygen
Increased partial pressure of carbon dioxide
Decreased partial pressure of carbon dioxide
Which of the following reactions occur in erythrocytes in the pulmonary capillaries?
Hb + CO2 → HbCO2
H2CO3 → H+ + HCO3 -
Hb + O2 → HbO2
HbO2 → Hb + O2
Which of the following factors is the most effective in increasing the rate of breathing in mammal?
The decrease of oxygen in the blood
The decrease of oxygen in the alveoli of lungs
The increase of carbon dioxide in the blood
The decrease of carbon dioxide in the blood
Which of the following reactions is catalyzed by carbonic anhydrase?
Combination of carbon dioxide and phosphoenolpyruvate
Combination of carbon dioxide and water to form carbonic acid
Dissociation of carbonic acid to produce hydrogen ion and hydrogen carbonate ion
Elimination of carbon dioxide
The following graph shows five oxygen dissociation curves for respiratory pigments. Which curves represents the oxygen dissociation curve for myoglobin?
A
B
C
D
Where does gas exchange occur in the respiratory system and what exactly diffuses in and out of the blood?
Diaphragm, Oxygen and Carbon Dioxide
Lungs, Oxygen and Nitrogen
Alveoli, Oxygen and Carbon Dioxide
Lungs, Carbon Dioxide and Glucose
The opening of the stoma involves
The sugar diffusion out of the guard cell.
The decrease of turgid pressure in the guard cell.
The increase of osmotic concentration in the in the guard cell.
The transportation of the active ion K+ out of the guard cell.
Which of the following explains Bohr effect?
The regulation of constant pH in blood. ions.
The hemoglobin affinity towards carbon dioxide.
The influence of carbon dioxide concentration on the dissociation of oxyhemoglobin.
The increase in dissociation rate of carbon dioxide due to the influence of ferum
Which of the following is the characteristic of hemeoglobin as a respiratory pigment?
Four hemeoglobin molecules can bind op to one oxygen molecule
Has low affinity for oxygen molecules
Release the oxygen molecule easily when partial pressure is high
Hemeoglobin in the presence of oxygen illustrates co-operative binding
In a two pigment system involving myoglobin,
the myoglobin has a lower affinity for oxygen than the hemoglobin and passes oxygen to the hemoglobin.
the myoglobin has a higher affinity for oxygen than the hemoglobin and passes oxygen to the hemoglobin.
the hemoglobin has a lower affinity for oxygen than the myoglobin and passes oxygen to the myoglobin.
the hemoglobin has a higher affinity for oxygen than the myoglobin and passes oxygen to the myoglobin.
Oxyhaemoglobin (HbO2) gives up oxygen faster where the ________ than it is in the lungs.
pH is lower.
blood is cooler.
O2 partial pressure is higher.
tCO2 partial pressure is lower.
Which statements are TRUE for myoglobin and haemoglobin molecules?
I.Both are conjugated proteins
II.Both are efficient oxygen carriers.
III.Their prosthetic group is haem.
IV.Both are secondary proteins.
1
II
III
IV
Breathing is usually regulated by
erythropoietin levels in the blood
the concentration of red blood cells
haemoglobin levels in the blood
CO2, pH, and O2 sensors
The diagram below represents the control of breathing. Which of the following terms best describes this control mechanism?
Negative feedback
Positive feedback
Reflex arc
Voluntary control
