Our heart acts like a pumping organ and blood pressure can be experienced when blood exerts pressure against our blood vessels. Blood pressure is a changing phenomenon and is affected by a number of factors like activity, rest, exercise, temperature, cold, diet, emotional state, posture, medications etc. high blood pressure (Hypertension) is an indicative of many problems. Normal blood pressure of a healthy individual is 120mmHg systolic and 80mmHg diastolic.