Journey Through the Circulatory System: A Grade 9 Adventure

Which letter shows the position of the heart?

• A

• B

• C

• D

Figure 1.3 shows a wound. Which blood component forms a blood clot to stop the bleeding?

Which component is a white blood cell?

• 1

• 2

• 3

• 4

Answer explanation

Phagocyte engulf Bacteria

Lymphocyte produces antibodies

Draw a red blood cell

What is the actual diameter of the cell?

• A 21 mm

• B 21mm/3000

• 21 mm x 3000

• 3000/ 21mm

What is the percentage of plasma in blood?

• 45%

• 55%

• 65%

• 75%

Figure 2.1 shows a blood vessel, vein.

Which one is the function of structure Z?

• It prevent the passage of nutrients.

• It prevents blood from flowing backwards.

• It prevents the entry of germs in wound.

A Pulse is the stretching and relaxation of an.................

What physiological response does the body undergo during exercise to meet the increased demand for oxygen and energy?

• Decrease in pulse rate

• Increase in pulse rate

• Decrease in breathing rate

• Increase in breathing rate

How does exercise impact the cardiovascular system?

• Causing the heart to pump less blood

• Decreasing the pulse rate

• Increasing the pulse rate to deliver oxygen and nutrients to the muscles

• No impact on the cardiovascular system