F2 1st Term IS WS 11 Answers

7.6       Breathing and breathing system

             in humans

A.     The importance of breathing

B.      Our breathing system

i      Words to know:

	English term	Write the words again	Chinese term
1	Respiration		呼吸作用
2	Gaseous exchange		氣體交換
3	Breathing		呼吸
4	Breathing system		呼吸系統
5	Lung		肺
6	Intercostal muscle		肋間肌
7	Diaphragm		橫膈膜
8	Rib		肋骨
9	Bronchus		支氣管
10	Trachea		氣管
11	Air sac		氣囊 / 肺泡

i      Matching:

Breathing	•Drawing of air in and out of the lungs
Gaseous exchange	•Exchange of oxygen and carbon dioxide between the air and the blood  inside lungs
Respiration	•Complicated chemical process which release energy from food

i      Fill in the blanks:

1       Our living cells need continuous supply of oxygen for use in respiration for releasing energy.

2       Breathing is a process by which air is repeatedly drawn into and out of the lungs.

3       Through gaseous exchange in our lungs, we obtain oxygen from the environment and release carbon dioxide to the environment. Oxygen in the air enters the blood while carbon dioxide leaves the blood and goes into the air.

4       In the human body, there is a well-developed breathing system that facilitates gaseous exchange. Lung is the part of this system in which gaseous exchange occurs.

5       Sequence (次序) of structures through which air enters the breathing system:

         Air à Nose à Trachea à Bronchi à small tubes à Air sacs

                     or mouth

6        Label the following diagrams:

7       In the air sacs, oxygen enters the blood (air / blood) from the air

while carbon dioxide leaves the blood and goes into the air.

8       The following table shows the difference between the blood entering and leaving the air sacs:

	Blood entering air sacs	Blood leaving the air sacs
Come from	Living cells / air sacs	Air sacs
Go to	Air sacs	Living cells
Oxygen content	Higher / Lower	Higher
Carbon dioxide content	Higher	Lower