Transport in organisms

Choose 3 components that make up the circulatory system.

• Blood

• Vessels

• Heart

• Lungs

What is a vessel?

• Something that can hold liquid.

• Something that pushes liquid.

What is a lumen?

• It is the hole or cavity inside the blood vessel.

• It is the wall of the blood vessel.

Which blood vessel has a larger lumen?

• Artery

• Vein

Arteries mostly carry ...

• Oxygen rich blood

• Oxygen poor blood

The blood transports nutrients.

• True

• False

Do protists have circulation systems?

• Yes

• No

Protists do not require a circulation system because ...

• Diffusion and movement of the cytoplasm is enough.

• They do not use as much oxygen as multicellular organisms.

Protists do not need specialised organs like lungs and intestines because ...

• Their surface area to volume ratio is high,

• Their surface area to volume ratio is low,

Why are no cells very large?

• Because large cells will have a lower surface area to volume ratio.

• Because large cells will have a higher surface area to volume ratio.