Question

muur uit temperature. (I dilemelCelsius).
14. We all breathe air that contains oxygen required for respiration. Breathing consists of inhalation and
exhalation. It continues throughout the life of an individual. These processes take place with the
help of muscular diaphragm and the rib cage. The diaphragm is a muscular partition which separates
the chest cavity from the lower abdominal cavity. The number of times a person breathes per minute
is termed as the breathing rate. An adult normally breathes from 14-20 times per minute while a
new born baby has a rate of about 40 breaths
per minute.
Answer the following questions.
a.) Define
1. Inhalation
2. Exhalation
b.) Name the muscular partition which separates the chest cavity from the lower abdominal cavity.
c.) What is the normal breathing rate of an adult?​

Answer 1

Answer:

The mechanics of breathing follow Boyle’s Law which states that pressure and volume have an inverse relationship.

The process of inhalation occurs due to an increase in the lung volume (diaphragm contraction and chest wall expansion) which results in a decrease in lung pressure in comparison to the atmosphere; thus, air rushes in the airway.

The process of exhalation occurs due to an elastic recoil of the lung tissue which causes a decrease in volume, resulting in increased pressure in comparison to the atmosphere; thus, air rushes out of the airway.

There is no contraction of muscles during exhalation; it is considered a passive process.

The lung is protected by layers of tissue referred to as the visceral pleura and parietal pleura; the intrapleural space contains a small amount of fluid that protects the tissue by reducing friction.

Key Terms

visceral pleura: the portion of protective tissue that is attached directly to the lungs

parietal pleura: the portion of the protective tissue that lines the inner surface of the chest wall and covers the diaphragm

Answer 2

Answer:

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