Question

What are the tree main factors of regulating blood pressure and define each? Explain the major factors that determine mean arterial pressure and what causes it to increase

Answer 1

1.Three main factors of regulating blood pressure are as follows-

a.Resistance - Blood travel through blood vessel ,experience the friction that is oppsoite to the blood flow.The resistance generated in the peripheral circulation in general.The resistance may arise from the blood vessel's length, blood vessel's diameter and blood viscosity.The blood vessel's length is diectly proportional to the resistance generated throughout. Therefore, increasing resistance increases due to longer length of the vessels ,can cause rise in the blood pressure.

b.Blood viscosity-Blood viscosity is the internal resistance to the blood flow associated with the thickness of the blood.The more viscous fluid makes the flow slower than the less viscous fluid. It diectly affect the peripheral resisatnce in the flow of blood.

c.Blood vessel diameter- Blood vessel diameter changes upon the demand of the body homeostasis system. Vasoconstrction and vasodialtion are the two methods by which blood pressure gets regulated in low and high blood pressure respectively.It depens on the temperature within the vessel or surrounding to that.

2.The mean arterial pressure is majorly determined by the  

a.The amount of blood enforced into the blood vessels

b.The arterial capacity to expand near to the heart.

When left ventricle inject the blood into the aorta, arteries experience the systolic pressure .When systolic phase finishes,the relaxation of ventricles occur.,then arterial capacity to expand i.e elastic recoil comes in picture and keeps blood flowing at much the lower pressures also.

The mean arterial pressure increases when there is decreased resistance in the flow and maintaned elastic recoil of smaller arterial blood vessels. The mean arterial pressure decreases when target tissue is far from heart ,having more resistance with loss of elastic recoil of small arterial vessels.