a) What is meant by residual volume?
b) What is the average breathing rate in adult human? When the breathing rate increases?
c) Why is it better to breathe through our nose than our mouth?
d) Name the muscles involved in breathing. Where these muscles are situated?
Answers
Answer:
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Answer:
(a) Residual volume (RV) is the volume of air remaining in the lungs after maximum forceful expiration. In other words, it is the volume of air that cannot be expelled, thus causing the alveoli to remain open at all times.
(b) Respiration rates may increase with fever, illness, and other medical conditions. When checking respiration, it is important to also note whether a person has any difficulty breathing. Normal respiration rates for an adult person at rest range from 12 to 16 breaths per minute.
(c)The nose also adds moisture and warmth to inhaled air for smoother entry to the lungs. Nasal breathing, as opposed to mouth breathing, has another important advantage, especially for effective and efficient exercise: It can allow for more oxygen to get to active tissues.
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