Match column I with column II Column 1 Column 2 SA node AV valve Lub sound Blood Pressure Aorta Pacemaker Sphygmomanometer Semilunar valve Hepatic portal vein Capillaries Endothelium Intestine Platelets Coagulation Systole Contraction High BP Hypertension

SA nodes generate cardiac impulses and so are called the pacemaker. Lub is the first heart sound that results from the closure of atrioventricular valves during ventricular systole. Column 1 Column 2 SA node Pacemaker Lub sound AV valve Aorta has an aortic semilunar valve that is made up of three cusps. A sphygmomanometer is used to measure blood pressure. Column 1 Column 2 Aorta Semilunar valve Sphygmomanometer Blood pressure Hepatic portal vein collects the blood (laden with food) from the intestine to transport it to the liver and not directly to the heart. This is done so that food can be absorbed for its nutrition in the liver. Capillaries consist of only one layer of epithelium called endothelium which allows diffusion of substances across their wall. The endothelium lines the inside of the heart and blood vessels. Column 1 Column 2 Hepatic portal vein Intestine Endothelium Capillaries Blood platelets help in the coagulation of blood. They release thromboplastin that initiates the coagulation mechanism. Systole means contraction of heart chambers. Column 1 Column 2 Platelets Coagulation Systole Contraction High blood pressure causes hypertension. Hypertension is a condition in which the blood pressure in the arteries is persistently elevated. Column 1 Column 2 High BP Hypertension

E M B I B E

ICSE Biology Book 2 for Class 10>Chapter 9 - Circulatory System>REVIEW QUESTIONS>Q 13

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The heart sound dub is produced by the closing of the valve. (lunar/semilunar)

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Important Questions on Circulatory System

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ICSE Biology Book 2 for Class 10>Chapter 9 - Circulatory System>REVIEW QUESTIONS>Q 15

The human heart consists of _____ chambers.

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ICSE Biology Book 2 for Class 10>Chapter 9 - Circulatory System>REVIEW QUESTIONS>Q 1

Match column I with column II

Column 1	Column 2
SA node	AV valve
Lub sound	Blood Pressure
Aorta	Pacemaker
Sphygmomanometer	Semilunar valve
Hepatic portal vein	Capillaries
Endothelium	Intestine
Platelets	Coagulation
Systole	Contraction
High BP	Hypertension