Blood pressure is the force of blood exerted against the walls of the arteries as the blood travels to all parts of the body. Blood pressure is generated by the heart's pumping action.
A certain amount of blood pressure is needed to get the blood to flow properly. Blood pressure varies throughout the day. It starts out lowest in the morning and as the day goes on, it gradually increases. Anxiety, excitement and strenuous exercise can also affect normal blood pressure by increasing it.