Grade 9 Heart Dissection Worksheet
A comprehensive worksheet for Grade 9 science students on heart dissection, covering external and internal anatomy, blood flow, and functions of different structures.
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Grade 9 Heart Dissection Worksheet
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Carefully read each question and provide your answers in the spaces provided. Refer to your dissection observations and notes.
1. Observe the external surface of the heart. Describe its general shape, color, and texture.
2. Identify and describe the function of the major blood vessels visible on the external surface of the heart. (e.g., aorta, vena cava, pulmonary artery/veins)
Figure 1: Cross-section of the human heart
3. The right atrium receives deoxygenated blood from the body through the and pumps it into the .
4. The valve prevents backflow of blood from the right ventricle into the right atrium.
5. Oxygenated blood from the lungs enters the left atrium via the and then flows into the .
6. The largest artery in the body, the , carries oxygenated blood from the left ventricle to the rest of the body.
7. Which chamber of the heart has the thickest muscular wall?
Right Atrium
Left Atrium
Right Ventricle
Left Ventricle
8. What is the primary function of the valves in the heart?
To pump blood
To regulate heart rate
To prevent backflow of blood
To carry oxygen
9. The pulmonary artery carries oxygenated blood away from the heart.
True
False
10. The septum divides the heart into left and right sides, preventing the mixing of oxygenated and deoxygenated blood.
True
False
Match each heart structure with its correct function.
11. Aorta
a. Prevents backflow between right atrium and ventricle
12. Tricuspid Valve
b. Carries oxygenated blood to the body
13. Pulmonary Artery
c. Carries deoxygenated blood to the lungs
14. Left Atrium
d. Receives oxygenated blood from the lungs
15. Based on your observations, explain why the left ventricular wall is significantly thicker than the right ventricular wall.
16. Discuss the importance of a complete septum in the human heart. What would be the consequences if there was a hole in the septum?