The pacemaker of the heart is:

Blood group O is called universal donor because:

The correct sequence of cardiac conduction is:

Erythropoietin is produced by:

The first heart sound (lub) is caused by:

Thrombocytes (platelets) are derived from:

Cardiac output is defined as:

The P wave in an ECG represents:

Which blood cells are biconvex and lack a nucleus?

Heparin, an anticoagulant, is secreted by:

The QRS complex of ECG represents:

Portal vein carries blood from:

Rh incompatibility between mother and fetus causes:

Lymph differs from blood in that it lacks:

Double circulation means:

Serum is blood plasma minus:

Granulocytes include:

Sino-atrial node generates impulses at rate of:

Blood pressure is measured by:

Eosinophils are associated with: