Question

Study the given figure of respiratory passage carefully and identify the parts labelled as A,B,C,D and E
                                            

A) A- Alveolar sac B- secondary bronchus C- Alveoli D- Bronchioles E- Trachea
B) A- Alveoli B- secondary bronchus C- Alveolar sac D- Trachea E- Bronchiole
C) A- Alveolar sac B- Tertiary bronchus C- Alveoli D- Trachea E- Bronchiole
D) A- Alveoli B- Tertiary bronchus C- Alveolar sac D- Bronchioles E- Trachea

Answer 1

Hint: In the process of respiration cells of an organism obtain energy through the combination of oxygen and glucose. In this whole process the carbon dioxide , water and ATP (energy) are released.

Complete Answer:
Contraction of external intercostal muscles lift up the ribs and sternum causing an increase in thoracic volume in the dorso -ventral axis.These modifications reduce pressure inside the thorax causing the expansion of lungs. Hence the pulmonary volume increases due to this intra pulmonary pressure decreases which is less than the atmospheric pressure. So that air moves in to lungs
The passage for the fresh air is :-
External nares- nasal cavity- internal nares- pharynx- glottis- larynx – trachea – bronchi- bronchioles- alveolar duct - alveoli

Additional information:
In the process of breathing
->The size of chest cavity changes when diaphragm and the ribs muscles expand and contract.
->When the size of chest cavity changes air pressure also changes
->Air moves in and out to the lungs when there is a change in the air pressure inside the chest cavity.
 ->One breathe involves one inhalation and one exhalation
->As per the need of oxygen changes as well as the average breathing rate also changes.

Hence the correct answer is option ‘A’ i.e, (A) Alveolar sac (B) Secondary bronchus (C)Alveoli (D) Bronchioles (E)Trachea





Note:Spirometer is used to measure respiratory rate . spirometer provide important information about how well the lungs are working. It helps to find out diseases related to the lungs . Average breathing rate at rest varies with age.