Question

Define Blood circulation

Answer 1

Blood circulation is the circulation of blood which carries various substances including gases throughout the body.

Circulatory System: The circulatory system is responsible for transport of various substances in human beings. It is composed of the heart, arteries, veins and blood capillaries. Blood plays the role of the carrier of substances.

Heart: Heart is a muscular organ; which is composed of cardiac muscles. It is so small that it can fit inside and adult’s fist. The heart is a pumping organ which pumps the blood. The human heart is composed of four chambers, viz. right auricle, right ventricle, left auricle and left ventricle.


Circulation of Blood through the heart:
Systemic Vein $\Rightarrow$ Sinus Venosus $\Rightarrow$ Right Auricle $\Rightarrow$ Right Ventricle $\Rightarrow$ Pulmonary Artery $\Rightarrow$ Lungs $\Rightarrow$ Pulmonary Vein $\Rightarrow$ Left Auricle $\Rightarrow$ Left Ventricle $\Rightarrow$ Aorta $\Rightarrow$ Systemic Circulation