Question 1:
State two differences between the circulatory systems of fish and humans.
Answer:
Fishes have a single circulatory system whereas humans have a double circulatory system. Fishes have an atrium and a ventricle while humans have two atria and two ventricles.
State two differences between the circulatory systems of fish and humans.
Answer:
Fishes have a single circulatory system whereas humans have a double circulatory system. Fishes have an atrium and a ventricle while humans have two atria and two ventricles.
Question 2:
Explain why the blood circulatory system of amphibians is considered as a closed and incomplete blood circulatory system.
Answer:
Oxygenated blood mixes with deoxygenated blood because amphibians possess a single undivided ventricle.
Explain why the blood circulatory system of amphibians is considered as a closed and incomplete blood circulatory system.
Answer:
Oxygenated blood mixes with deoxygenated blood because amphibians possess a single undivided ventricle.
Question 3:
The flatworm is a multicellular organism. However, the flatworm does not require a specialised transportation system to move substances in and out of the cell. Explain why.
Answer:
The flat body of flatworms provide a large total surface area to volume ratio for the efficient diffusion of materials required by cells.
The flatworm is a multicellular organism. However, the flatworm does not require a specialised transportation system to move substances in and out of the cell. Explain why.
Answer:
The flat body of flatworms provide a large total surface area to volume ratio for the efficient diffusion of materials required by cells.
Question 4:
Explain why insects need one separate system (the tracheal system) to transport oxygen.
Answer:
The open circulatory system in insects is unable to distribute oxygen to all body cells. Therefore, insects need a tracheal system to transport oxygen to support active activities.
Explain why insects need one separate system (the tracheal system) to transport oxygen.
Answer:
The open circulatory system in insects is unable to distribute oxygen to all body cells. Therefore, insects need a tracheal system to transport oxygen to support active activities.