Page 38 - 新思维科学学生用书8 样章
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1 Respiration
c A Respiration means using your diaphragm to move air into the lungs.
B Respiration is the diffusion of gases between the air sacs and the blood.
C Respiration is a series of chemical reactions that releases useful energy
from glucose. [1]
d A Muscles in the lungs contract to make air move into them.
B The diaphragm muscles contract to move air into the lungs.
C Muscles between the ribs pull them downwards when we breathe in. [1]
1.4 The diagrams show two blood cells.
a Copy the drawing of the red blood cell.
Label the cell membrane and cytoplasm. [1]
b Name two structures that most cells have, but that red blood cells do not have. [2]
c The white blood cell shown in the diagram kills pathogens by producing
chemicals. Describe how it does this. [2]
d Other kinds of white blood cell have a different way of killing pathogens.
Explain how they do this. [3]
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