Ventricle ,Blood Pressure and Blood Vessels

Ventricle

Venricles have thicker wall as compared to atrium as it have pump to pump the blood to the rest of the body, whereas atrium have to only transfer blood to the ventricle

Valves present in heart ensures that blood does not flows backward.

Amphibians and some reptiles have three chambered heart as they do not need more energy to maintain there body temprature.

Fishes have two chambered hearts and blood is directly supplied from gills to the rest of body after pumping from heart to gills.
Thus here blood flows only once in the heart i.e single circulation and in other organisms it flows twice in single cycle i.e Double Circulation.

Blood Pressure

Definetion of Blood Pressure- The fore that blood exerts on the wall of a vessel is called blood pressure.

Systolic Pressure- it occurs when ventricle conracts also called as ventricle systole.
Average pressure = 120 mhz
Diastolic Pressure - It occurs when ventricle relax, also called as ventricular diastole.
Average Pressure = 80 mHz

Blood Pressure is measured by An instruement which is called Sphygamomanometer

When blood pressure increases from average i.e 120 mHz then it is called Hypertension. It is caused due to the constriction of alveoli.