Human Circulatory System Quiz - ICSE Class 8 Science
Free practice quiz: Human Circulatory System (ICSE Class 8 Science). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which chamber of the heart receives deoxygenated blood from the body?
- Left atrium
- Right atrium
- Left ventricle
- Right ventricle
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Answer: B. Right atrium
The right atrium is the chamber that receives deoxygenated blood returning from all parts of the body through the superior and inferior vena cava.
Which of the following is a function of the lymphatic system that complements the circulatory system?
- Transporting oxygen to tissues
- Returning excess tissue fluid back to the bloodstream
- Pumping blood throughout the body
- Removing carbon dioxide from the blood
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Answer: B. Returning excess tissue fluid back to the bloodstream
The lymphatic system collects excess fluid (lymph) that leaks out of blood capillaries into the tissues and returns it to the bloodstream. This prevents tissue swelling (edema) and helps maintain blood volume.
The systemic circulation starts from which chamber of the heart?
- Right atrium
- Right ventricle
- Left atrium
- Left ventricle
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Answer: D. Left ventricle
The left ventricle pumps oxygenated blood into the aorta, which is the beginning of the systemic circulation that supplies the rest of the body.
The force exerted by the blood against the walls of the blood vessels is known as:
- Cardiac output
- Blood pressure
- Heart rate
- Blood viscosity
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Answer: B. Blood pressure
Blood pressure is the pressure of circulating blood against the walls of blood vessels. It is essential for blood flow throughout the body.
Which of the following valves prevents the backflow of blood from the aorta into the left ventricle?
- Tricuspid valve
- Mitral valve
- Pulmonary valve
- Aortic valve
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Answer: D. Aortic valve
The aortic valve is a semilunar valve located between the left ventricle and the aorta. It opens to allow blood to be pumped into the aorta and closes to prevent blood from flowing back into the ventricle.