Dissection ( Topic 3)

Question 1

Why should you take photos of the heart before you start your dissection?

Answer 1

To see if we can identify the coronary arteries.

Question 2

How could you see the closing and opening of the semi-lunar valves?

Answer 2

1. Identify the aorta and the pulmonary artery, and place water inside them. This will cause the semi-lunar valves to close as it creates a higher pressure in the arteries compared to the ventricle.
2. Squeezing the heart will cause the pressure in the ventricles to be higher than in the ventricles compared to arteries, so the semilunar valves will open and water will water will be pushed out.

Question 3

What is the risk of dissecting an animal organ?

Answer 3

Contracting bacteria from the organ or spreading it to other people.

Question 4

What are the prevention methods used to prevent the spread of bacteria?

Answer 4

1. Wear a lab coat.
2. Cover any cuts with a bandage.
3. Wear gloves.
4. Wash any instruments used with a detergent and then a disinfectant.
5. Wash your hands after you are done with the dissection.
6. Dispose of any gloves or paper towels you used immediately after you are done using them.
7. The heart must be discarded in a separate bin that should be discarded on the same day.

Question 5

What is the risk of using a scalpel and a dissection needle?

Answer 5

They are very sharp and you could cut yourself or other people.

Question 6

What are the prevention methods used to prevent cuts?

Answer 6

1. Cut away from yourself.
2. Never point the sharp objects towards other people, and never run with them either.

Question 7

What should you do when you present your findings?

Answer 7

1. Label the 4 chambers, the valves, the arteries, the veins and the cords.
2. Make sure the labels don’t cover the important parts.
3. Label both the pictures you took and make your drawing.
4. Use a scale bar in your drawing.
5. Don’t have any shading or colouring on your drawing.