Science Practice Quiz 55

Q1.Which of the following substances is transported by plasma in dissolved form, according to the provided text?

A. Oxygen B. Red blood corpuscles C. Food D. Haemoglobin

Q2.What component of blood is primarily responsible for carrying oxygen in human beings?

A. Plasma B. White blood cells C. Red blood corpuscles D. Platelets

Q3.Which instrument is used to measure blood pressure?

A. Stethoscope B. Sphygmomanometer C. Electrocardiograph D. Thermometer

Q4.What is the medical term for high blood pressure?

A. Hypotension B. Bradycardia C. Hypertension D. Tachycardia

Q5.What is a primary cause of hypertension?

A. Dilation of venules B. Increased elasticity of arteries C. Constriction of arterioles D. Decreased resistance to blood flow

Q6.How is blood pressure defined in the context of blood vessels?

A. The volume of blood flowing through a vessel per minute. B. The force that blood exerts against the wall of a vessel. C. The rate at which the heart pumps blood. D. The resistance of blood flow in capillaries.

Q7.What are the normal values for systolic and diastolic blood pressure, respectively?

A. 80 mm of Hg and 120 mm of Hg B. 120 mm of Hg and 80 mm of Hg C. 100 mm of Hg and 70 mm of Hg D. 140 mm of Hg and 90 mm of Hg

Q8.What is the primary function of arteries in the circulatory system?

A. To collect blood from organs and return it to the heart. B. To facilitate the exchange of materials between blood and cells. C. To carry blood away from the heart to various organs. D. To regulate blood pressure within the heart chambers.

Q9.Why do arteries have thick, elastic walls?

A. To allow for easy exchange of materials with surrounding cells. B. To prevent blood from flowing in the wrong direction. C. Because blood emerges from the heart under high pressure. D. To collect blood from different organs efficiently.

Q10.What is the purpose of valves found in veins?

A. To increase the pressure of blood returning to the heart. B. To prevent the backflow of blood, ensuring it flows in one direction. C. To facilitate the exchange of nutrients and waste products. D. To make their walls thick and elastic.

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Science Practice Quiz 55