Questions

The mammalian heartis called myogenic (myo = muscle, genie = originating from). It means the heart beat or the activities of the heart are auto regulated which originates from a muscle called nodal tissue.In the human heart,heartbeat originates and contraction is initiated by a special modified heart muscle known as sinoatrial node. It is located in the right atrium; while the QRS waves are the depolarisation of the ventricles, which initiates the ventricular contraction.The T-wave represents the repolarisation,that is, the return of the ventricles from excited tonormal state.Hepatic portal system is the unique vascular connection that exists between the digestive tract and liver. This vein carries blood from intestine to the liver.

The complexity and variety of organic molecules is due to the chemical versatility of carbon atoms.

Thousands of US and Filipino prisoners of war died as they are marched to death by Japanese Military in 1942.

Nicolaus Copernicus was decribed by his work on "The Heliocentric Theory" which is based on that the earth revolves around the Sun.

This theory was developed in parts by different astronomers over many years, namely Aristarchus, Copernicus, Kepler, and Galileo.