Carbon dioxide (CO2) diffuses into blood from tissue site and passes to alveolar site in the form of
bicarbonate; 70%
bicarbonate; 20 - 25%
carbaminohaemoglobin; 60 - 70%
carbaminohaemoglobin; 7%
A.
bicarbonate; 70%
Blood is the medium of transport of O2 and CO2. About 20 - 25% of CO2 is transported by RBCs as carbaminohaemoglobin whereas 70% of it is carried as bicarbonate through plasma. The largest fraction of CO2 is converted to bicarbonate ions (HCO-3) and is transported in plasma. When CO2 diffuses into the RBCs, it combines with H2O and forms carbonic acid (H2CO3). It is unstable and quickly dissociates into hydrogen ions and bicarbonate ions.
Assertion: S.A. node induces excitatory impulses in heart.
Reason: S.A. node is self excitatory.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Select the option having all the correct characteristics.
| Structure | Percentage of WBCs | Function |
| 0.3 - 0.5 | Phagocytic |
| Structure | Percentage of WBCs | Function |
| 0.5 - 1.0 | Secrete histamine and serotonin |
| Structure | Percentage of WBCs | Function |
| 30 - 40 | Defense against parasites |
| Structure | Percentage of WBCs | Function |
| 30 - 40 | Allergic reactions |
Which one is correct regarding electrocardiograph (ECG)?
P- wave represents the electrical excitation of the ventricle.
QRS complex represents repolarisation of the ventricles
T- wave represents repolarisation of the atria
By counting the number of QRS complexes one can determine the pulse rate
Which of the following is an incorrect statement
Blood group 'O' person have A and B antigens on RBCs.
Eosinophils resist infections and are associated with allergic infection.
RBC's contain carbonic anhydrase.
T wave of normal ECG represent of depolarization of ventricle.
Assertion : Angina pectoris means "pain in the chest".
Reason : It results due to carrying of extra blood to the heart muscle.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: On touching radial artery in our wrist, we feel pulse waves.
Reason : The heart beats originate from the sinoatrial node (SA node) on the right atrium.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are hue but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The opening between the right atrium and the right ventricle is guarded by the valve named
bicuspid valve
mitral valve
tricuspid valve
semilunar valve.
