The Circulatory System

Science JC HL

Sample Question and Answers

The Circulatory System

Science JC HL

Sample Questions & Answers

Blood

  1. (a) The photograph shows a red blood cell and a white blood cell taken using an electron microscope. Give one function for each type blood cell. (6)
    1. The diagram shows cross sections of an artery and of a vein. Why do arteries have much thicker walls than veins?

Give one other structural difference between arteries and

veins.

(6)

  1. Red blood cells carry oxygen around the body White blood cells protect against infection
  2. Blood is under pressure

Veins have valves to prevent back-flow

Science JC HL

Sample Questions & Answers

  1. Blood is a liquid tissue. The diagram shows blood viewed through a microscope.

(i) Name any two components of blood shown in the diagram. (6)

(ii) Give the function of each of the components of blood you have named. (6)

  1. Red Blood cells and white blood cells
  2. Red blood cells carry oxygen around the body White blood cells protect against infection

(iii) The diagram shows the human heart.

Why has the left ventricle got a thicker wall than the right ventricle?

(3)

(iii) Left side has to pump blood further; all round the body

Science JC HL

Sample Questions & Answers

  1. The diagram shows a person’s pulse rate being taken. (i) What causes a person’s pulse? (3)

(ii) How is a person’s pulse rate measured using this method? (6)

(iii) An athlete’s resting pulse rate is 58. After 10 minutes strenuous exercise their pulse rate was 120. After resting for 5 minutes their pulse rate reduced to 63.

Clearly account for the rise and fall in pulse rate experienced by the athlete

(6)

  1. The heart beating
  2. Count the number of beats in 1 minute
  3. He needs more oxygen She needs less oxygen

Science JC HL

Sample Questions & Answers

  1. (a) Label clearly the pulmonary artery with an A, and the pulmonary vein with a V in the diagram of the heart.

(a)

  1. The simplified diagram shows the flow of blood through the lungs, heart and the rest of the body.

(i) Name the blood vessels labelled A and B. (6)

Capillaries are small blood v...

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