Answer: The normal respiration rate for an adult at rest is 12 to 20 breaths per minute. While A respiration rate under 12 or over 25 breaths per minute while resting is considered abnormal.
Difussion occurs from a high concentrated region to a low concentrated region. The velocity of diffussion is proportional to the differential of concentrations. In the lung arrives blood with low levels of oxygen while the long is rich with fresh oxygen so the oxygen flows from the lung tissues to the blood.
The other tissues consume oxygen continually them they get poor in oxygen and so the oxygen that is in the blood diffuses to the tissue that is poor in oxygen.
Answer:
this is because they are trying to end the pain they have inside and for the moment while doing these activities the pain goes away or is transferred to another thing.
