呼吸運動：练习题

• a.

  Diaphragm contracts → diaphragm becomes domed → volume of thorax increases → pressure decreases

• b.

  Diaphragm relaxes → diaphragm flattens → volume of thorax increases → pressure increases

• c.

  Intercostal muscles contract → ribcage pulls upwards → volume of thorax increases → pressure decreases

• d.

  Intercostal muscles relax → ribcage moves downwards → volume of thorax decreases → pressure increases

• a.

  The intercostal muscles contract pulling the ribcage up, and the diaphragm flattens, increasing thorax volume and decreasing pressure.

• b.

  The volume of the thorax decreases, which increases the pressure to above atmospheric pressure.

• c.

  The diaphragm relaxes into a dome shape, which draws air into the bronchioles through a vacuum effect.

• d.

  The intercostal muscles relax and the diaphragm moves upwards, forcing air into the lungs.

• a.

  Intercostal muscles contract, ribcage moves upward, diaphragm flattens, volume of thorax increases.

• b.

  Intercostal muscles relax, ribcage moves downward, diaphragm becomes domed, pressure in thorax increases.

• c.

  Intercostal muscles contract, ribcage moves downward, diaphragm flattens, pressure in thorax increases.

• d.

  Intercostal muscles relax, ribcage moves upward, diaphragm becomes domed, volume of thorax decreases.

• a.The diaphragm relaxes into a domed shape, increasing thorax volume to draw air in.
• b.The diaphragm contracts and flattens, increasing thorax volume and decreasing internal pressure.
• c.The pressure inside the thorax increases to a level above atmospheric pressure, causing air to enter.
• d.The intercostal muscles relax, pulling the ribcage downwards and forcing air into the lungs.

先自己写一遍答案，再对照解题步骤。

先自己写一遍答案，再对照解题步骤。

先自己写一遍答案，再对照解题步骤。