Body Fluids and Circulation Test - 2

T-wave represents the return of the ventricles from excited to normal state. The end of T-wave marks the end of systole.

Angina pectoris is the chest pain that occurs due to an inadequate supply of oxygen to the heart. It occurs due to conditions that affect the blood flow.

The electrical signal that passes between the atria and ventricles through a group of cells is called the atrio-ventricular (AV) node. The signal slows down as it passes through the AV node.

Besides autonomic nervous system, adrenal medullary hormones can also increase the cardiac output.

The bundle of His or His bundle is a collection of heart muscle cells specialised for electrical conduction. Bundle of His passes down the inter-ventricular septum and divides into two branches, one of which is distributed to each ventricle through a fine network of fibres. In this way, wave of contraction travels from auricles to ventricles.

They are the second largest component of plasma and constitute about 7% of the total plasma content. Plasma has about 70 types of proteins.

Hageman factor, along with high molecular weight kininogen, leads to the activation of Factor XI.

Coelom is absent in fasciola. Circulation occurs in space between internal walls. Its body contains a special tissue called parenchyma, which encloses a network of fluid filled spaces.

In this step, both the atria get filled with blood. The atrial systole takes about 0.1 second.

Due to the presence of a separate circulatory system, this system is insulated from pollutants, chemicals, and acidic and alkaline materials.