Given below is the ECG of a normal human. Which one of its components is correctly interpreted below?

1.	Peak P-Initiation of left atrial contraction only
2.	Complex QRS-One complete pulse
3.	Peak T-Initiation of total cardiac contraction
4.	Peak P and Peak R together-systolic and diastolic blood pressures

The haemoglobin content per 100 ml of blood of a normal healthy human adult is:

1. 25-30 g

2. 17-20g

3. 12-16 g

4. 5-11

The correct statement in respect of protein haemoglobin is that it:

1. Maintains blood sugar level

2. Acts as an oxygen carrier in the blood

3. Forms antibodies and offers resistance to diseases

4. Functions as a catalyst for biological reactions 

Erythroblastosis fetalis is caused when:

1. Rh^– female & Rh⁺ male

2. Rh⁺ female & Rh^– male

3. Rh⁺ female & Rh⁺ male

4. Rh^– female & Rh^– male

Which of the following conditions causes erythroblastosis fetalis?

1. Mother ${\mathrm{Rh}}^{+\mathrm{ve}}$ and fetus ${\mathrm{Rh}}^{-\mathrm{ve}}$

2. Mother ${\mathrm{Rh}}^{-\mathrm{ve}}$ and fetus ${\mathrm{Rh}}^{+\mathrm{ve}}$

3. Both mother and fetus ${\mathrm{Rh}}^{-\mathrm{ve}}$

4. Both mother and fetus ${\mathrm{Rh}}^{+\mathrm{ve}}$

Which of the following is associated with a decrease in cardiac output?

1. Sympathetic nerves

2. Parasympathetic neural signals

3. Pneumotaxic center

4. Adrenal medullary hormones

Persons with 'AB' blood group are called as "Universal recipients". This is due to:

Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?

1. Epinephrine

2. Thrombokinase

3. Thrombin

4. Renin

Match the following columns and select the correct option:

The QRS complex in a standard ECG represents:

1.  Depolarisation of auricles

2.  Depolarisation of ventricles

3. Repolarisation  of ventricles

4.  Repolarisation of auricles