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Class IX Biology: Blood and Circulatory System

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Class IX Biology: Blood and Circulatory System

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Questions and Answers

Why does the heart have different chambers?

To regulate the body's temperature

To store excess blood during physical activity

To increase the efficiency of blood circulation in the body

To prevent oxygen-rich blood from mixing with carbon dioxide-rich blood (correct)

Which component of blood is responsible for transporting oxygen?

Red blood cells (correct)

Plasma

White blood cells

Platelets

What is the function of the left atrium in the heart?

To remove carbon dioxide from the blood

To store excess blood during physical activity

To pump oxygenated blood to the rest of the body

To receive oxygen-rich blood from the lungs (correct)

Why is a pumping organ needed to push blood around the body?

To maintain blood pressure and ensure circulation to all tissues Signup and view all the answers

What is the function of the thick muscular walls of the ventricles?

To pump blood to various organs Signup and view all the answers

Why is the separation of the right side and left side of the heart useful?

To allow for a highly efficient supply of oxygen to the body Signup and view all the answers

What is the purpose of measuring blood pressure with a sphygmomanometer?

To detect hypertension caused by constricted arterioles Signup and view all the answers

Why is high blood pressure also called hypertension?

Due to increased resistance to blood flow Signup and view all the answers

What is the role of valves in the heart?

To ensure blood does not flow backwards when the atria or ventricles contract Signup and view all the answers

Why do amphibians and many reptiles have three-chambered hearts?

To tolerate mixing of oxygenated and deoxygenated blood streams Signup and view all the answers