Five factors influence blood pressure:

The three most important factors affecting resistance are blood viscosity, vessel length and vessel diameter and are each considered below. Blood viscosity is the thickness of fluids that affects their ability to flow.

What are the 4 main factors affecting blood pressure? Peripheral resistance, Vessel elasticity, Blood volume and cardiac output. Blood cells and plasma encounter resistance when they contact blood vessel walls.

• Cardiac output.
• Peripheral vascular resistance.
• Volume of circulating blood.
• Viscosity of blood.
• Elasticity of vessels walls.

How Blood Volume Affects Blood Pressure. Changes in blood volume affect arterial pressure by changing cardiac output. An increase in blood volume increases central venous pressure. This increases right atrial pressure, right ventricular end-diastolic pressure and volume.

(Reuters Health) – Though previous research has suggested high blood pressure may be more dangerous for thinner people, a new study finds the cardiovascular disease risks are similar – and high – for the lean, overweight and the obese.

Normal: Blood pressure below 120/80 mm Hg is considered to be normal. Elevated: When blood pressure readings consistently range from 120 to 129 systolic and less than 80 mm Hg diastolic, it is known as elevated blood pressure.

Its final recommendation, issued in 2014, said that adults aged 60 or older should only take blood pressure medication if their blood pressure exceeds 150/90, a higher bar of treatment than the previous guideline of 140/90.