DeCarteret College
Grade Nine General Science Worksheet
Transport System in Humans
Instructions: Circle the letter which corresponds to the correct answer for each question
below.
1. The main components of the blood are?
A. red blood cells, white blood cells, antibodies, and platelets
B. red blood cells, phagocytes, plasma, and platelets
C. red blood cells, white blood cells, plasma, and platelets
D. red blood cells, lymphocytes, phagocytes, and platelets
2. What are the three main types of blood vessels in the circulatory system?
A. aorta, veins, and capillaries
B. arteries, veins, and capillaries
C. arteries, valves, and capillaries
D. arteries, ventricles, and capillaries
3. Atherosclerosis, a cardiovascular disease, can be defined as?
A. The built up of pressure in the arteries.
B. The hardening of arteries.
C. The narrowing of arteries.
D. The lack of oxygen in the heart muscles.
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Item 4 refers to the following diagram
I
4. What is the name of the part labelled I ?
A. Aorta
B. Pulmonary artery
C. Pulmonary vein
D. Vena Cava
Instructions: Circle ‘T’ if the statement is TRUE and ‘F’ if the statement is FALSE.
5. The veins carry blood away from the heart at high pressure.
T
F
6. Arteriosclerosis occurs when the coronary artery which transports oxygen to the heart is
blocked due to the build-up of substances such as fat.
T
F
7. The capillaries are responsible for the exchange of materials between the blood and the
cells of the body.
T
F
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Instructions: On the line to the right of each phrase in Column I, write the letter for the word
in Column II that best matches the phrase.
Each word in Column II may be used once or not at all.
Column I
8. Cell fragments containing no nucleus which help blood to clot to
prevent blood loss. ______
9. These are flat and hallowed at the centre with no nucleus.
Column II
A. Red blood cells
B. Phagocytes
C. Lymphocytes
Their main function is to transport oxygen from the lungs to
D. Platelets
other cells of the body. ______
E. Pulmonary vein
10. Transports deoxygenated blood from the body to the right side of
F. Vena Cava
the heart. ______
11. They help the body to fight disease by producing antibodies,
antigens, and antitoxins. ______
Section D – Short Answer Questions
Instructions: For questions 12 and 13, write your responses on the lines provided below.
12. Why is a transport system needed in humans? (3 marks)
___________________________________________________________________________
___________________________________________________________________________
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13.
I
II
III
Figure 2- Longitudinal Section Through the Heart
a) Name the structures labelled I, II and III in figure 2 above. (3 marks)
I ____________________
III ___________________
II ____________________
b) State one way in which structure II differs from that of structure III. (2 marks)
________________________________________________________________
c) Give a reason for the difference mentioned in (b) above. (2 marks)
__________________________________________________________________
d) What is the function of the structure labelled I in figure 2 above? (2 marks)
_________________________________________________________________
14. Using FOUR arrows ONLY, show the direction of the flow of blood into and out of the
human heart illustrated in figure 2. (4 marks)
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