The inter-atrial septum in the human heart can be best described as:

1. A thin muscular wall

2. A thick muscular wall

3. A thin fibrous tissue

4. A thick fibrous tissue

The sino-atrial node is the normal pacemaker of the human heart because:

What percentage of ventricular filling is achieved by atrial contraction?

1. 30

2. 50

3. 70

4. 90

In a surface ECG the QRS complex represents:

1. Atrial depolarization

2. Atrial repolarization

3. Ventricular depolarization

4. Ventricular repolarization

Normal activities of the human heart are regulated:

1. Intrinsically

2. By the autonomic nervous system

3. By the brain stem

4. By the diencephalon

A common symptom produced by myocardial ischemia is:

1. Hypertension

2. Vertigo

3. Angina

4. Hyperventilation

The steps of the cardiac cycle in sequence are...

1. isovolumic contraction, isovolumic relaxation, ejection, passive ventricular filling, active ventricular filling.

2. isovolumic relaxation, isovolumic contraction, ejection, passive ventricular filling, active ventricular filling.

3. isovolumic contraction, ejection, isovolumic relaxation, passive ventricular filling, active ventricular filling.

4. isovolumic contraction, ejection, isovolumic relaxation, active ventricular filling, passive ventricular filling

A decrease in plasma albumin levels is likely to affect:

1. Clot formation

2. Oxygenation of hemoglobin

3. Osmotic balance

4. Immune functions

Which of the following is a correct statement:

1. The volume of blood in pulmonary circulation is more than the volume of blood in systemic circulation at any instant

2. The blood pressure in pulmonary circulation is less than that of the systemic circulation

3. Double circulation is characteristic of all vertebrates

4. A double aortic arch is seen in birds and mammals

There is a possibility of exposure of the maternal blood [of Rh -ve mother] to small amounts of Rh +ve blood from the fetus during the:

1. First trimester of any pregnancy

2. Third trimester of the second pregnancy only

3. Delivery of the child

4. There is no such possibility