Friction arises when two solid objects touch each other. When the friction force is larger than the movement force, the body does not move; when the friction force is smaller than the movement force,...
Heart diseases lead to death, so keeping your circulatory system healthy will decrease your risk of a heart attack. You should keep exercising to strengthen the heart muscle and activate blood circulation.
Blood circulation is the path of the blood throughout the body. It can be divided into two small circulations, which are the minor (pulmonary) blood circulation and the major (systemic) blood circulation.
Blood is a red liquid. It consists of the plasma, the blood platelets, the red blood cells (the corpuscles), and the white blood cells (The corpuscles).
