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Chapter: 10th Science : Chapter 14 : Transportation in Plants and Circulation in Animals

Blood pressure

Blood pressure is the force exerted during the flow of blood against the lateral walls of arteries. The blood pressure is high in the arteries gradually drops in the arterioles and capillaries and become very low in the veins.

Blood pressure

Blood pressure is the force exerted during the flow of blood against the lateral walls of arteries. The blood pressure is high in the arteries gradually drops in the arterioles and capillaries and become very low in the veins.

Blood pressure is usually expressed in terms of the systolic pressure and diastolic pressure.

Systolic pressure: During ventricular systole, the left ventricle contracts and forces blood into the aorta. The pressure rises to a peak which is referred as systolic pressure.

Diastolic pressure: During diastole, the ventricles relax and the pressure falls to the lowest value which is referred as diastolic pressure.

In an healthy adult during normal resting condition systolic and diastolic blood pressure is expressed as 120mm / 80mm Hg. Blood pressure varies during conditions of physical exercise, anxiety, emotions, stress and sleep.

A prolonged or constant elevation of blood pressure is a condition known as hypertension (High blood pressure) can increase the risk of heart attack and stroke. Decrease in blood pressure is termed hypotension (Low blood pressure).

 

Stethoscope

A stethoscope is used to detect the sound produced by the internal organs of human body. The heart sound is heard by placing the stethoscope on the chest. It is a useful diagnostic tool to identify and localize health problems and diagnose disease. The modern electronic stethoscopes are high precisioned instruments.


 

Sphygmomanometer

Sphygmomanometer is a clinical instrument used to measure blood pressure when a person is in a relaxed and resting condition. The pressure of the brachial artery is measured. It helps to estimate the state of blood circulation and the working of the heart. It helps to diagnose conditions such as increased or decreased blood pressure. Monometric and modern digital types are the apparatus used to measure blood pressure.



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10th Science : Chapter 14 : Transportation in Plants and Circulation in Animals : Blood pressure |


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