Page 20 - 新思维科学活动用书8 样章

1.5 Blood

Exercise 1.5B Functions of blood components

Practice

In this exercise, you will think about suitable words to complete sentences about blood.
Choose the best words to complete the sentences.

antibodies bacteria carbon dioxide cytoplasm
glucose haemoglobin least like nucleus

most oxygen plasma unlike

Blood contains a pale yellow liquid, called .

This liquid carries red blood cells and white blood cells around the body. It also transports several
different substances in solution, including and .

Red blood cells are the abundant cells in the blood. Their function is to
transport from the lungs to all the cells in the body that are respiring. To help
them to do this, they contain a red pigment called .

White blood cells, red blood cells, contain a nucleus.
Their function is to destroy pathogens, such as , that get into the body. Some

of them do this by producing chemicals called , which attach themselves to
the pathogens and kill them. Other white blood cells kill pathogens by taking them into their
and digesting them.

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