Transport systems

Question 1

What are the two paths our blood circulates in?

Answer 1

Heart to Lungs to Heart (1st)

Heart to the rest of the body to the Heart (2nd)

Question 2

Cells need to…

Answer 2

be constantly supplied with oxygen and nutrients

remove waste products

Question 3

Why do unicellular organisms not need a transport system?

Answer 3

Substances move in and out of the cell directly

Question 4

Why do multicellular organisms need a transport system?

Answer 4

Most of their cells are not in contact with the environment and cannot obtain oxygen and nutrients directly

Question 5

What is a heart?

Answer 5

An organ that pumps blood around the body. It is about the size of our fist and the walls are made of muscles.

Question 6

What are blood and its functions?

Answer 6

A liquid that carries substances such as nutrients, oxygen and carbon dioxide to and from cells in the body.

Question 7

What does blood contain?

Answer 7

Red blood cells that do not contain a nucleus so can carry more haemoglobin which combines with oxygen to be carried around the body.