CIE IGCSE Biology: 复习笔记：11.1.5 Investigating the Effects of Physical Activity on Breathing

• Exercise increases the frequency and depth of breathing
• This can be investigated by counting the breaths taken during one minute at rest and measuring average chest expansion over 5 breaths using a tape measure held around the chest
• Exercise for a set time (at least 3 minutes)
• Immediately after exercising, count the breaths taken in one minute and measure the average chest expansion over 5 breaths
• Following exercise, the number of breaths per minute will have increased and the chest expansion will also have increased

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