R-% biology

Which body system absorbs oxygen from the surrounding air?

• Circulatory system
• Digestive system
• nervous system

• Respiratory system

In which organ is oxygen absorbed into the blood? 

• Gills
• Mouth
• Nose 
• Stomata 

In our lungs, _________ is removed and ________ is absorbed. 

• oxygen ... carbon dioxide 
• carbon dioxide ... oxygen
• oxygen ... nitrogen 
• carbon dioxide ... nitrogen

What transports oxygen from our lungs to other parts of the body? 

• air tubes
• gills
• blood 
• stomata

Lungs are part of the __________ system of a human. 

• circulatory 
• respiratory
• digestive
• muscular

We only breathe in oxygen and give out carbon dioxide.

• True
• False

Gills take in oxygen from the water while lungs take in oxygen from the air.

• True
• False

The air we breath in contains only oxygen.

• True
• False

Si Min breathes in and out of a paper bag three times. How has the oxygen and carbon dioxide in the bag changed after three breathes?

• Oxygen : increase, 
  Carbon dioxide : Increase
• Oxygen : increase, 
  Carbon dioxide : decrease
• Oxygen : decrease, 
  Carbon dioxide : Increase
• Oxygen : decrease, 
  Carbon dioxide : decrease

The body systems that work together to take in oxygen to all parts of the body are ＿＿＿＿＿＿ systems ．

• digestive and circulatory 
• digestive and muscular 
• circulatory and respiratory
• circulatory and muscular