A unique feature of the avian respiratory system is the presence of air sacs. Which of the following is NOT a function of these air sacs?
Reduce the weight of the bird
Act as bellows to move air through the lungs
Direct gas exchange with the blood
Help maintain a unidirectional airflow through the lungs
Related Questions
A patient presents with significantly reduced lung compliance, making it difficult to inflate their lungs. Which of the following conditions is the LEAST likely cause of this decreased compliance?
Pulmonary fibrosis
Asbestosis
Emphysema
Infant Respiratory Distress Syndrome (IRDS)
The volume of air remaining in the lungs after a forceful expiration is called:
Tidal Volume
Expiratory Reserve Volume
Residual Volume
Inspiratory Reserve Volume
Which of the following statements regarding the chloride shift in the respiratory system is INCORRECT?
Chloride ions move into the red blood cell as bicarbonate ions move out.
It occurs in systemic capillaries.
It is essential for maintaining electrical neutrality during CO2 transport.
It results in a decrease in the pH of the red blood cell
A patient with chronic obstructive pulmonary disease (COPD) experiences difficulty exhaling completely. Which of the following physiological changes is LEAST likely to contribute to this impaired exhalation?
Loss of elastic recoil in the lungs
Airway obstruction due to mucus and inflammation
Increased lung compliance
Collapse of smaller airways during exhalation
The conducting portion of the respiratory tract performs all of the following functions EXCEPT:
Gas exchange
Trapping of dust particles
Adjusting air temperature
Moistening inhaled air
Lungs comprises
Network of bronchi
Bronchioles
Alveoli
All of these
Layer of uneven columnar cells from tracheal lining are composite
Brush border epithelium
Stratified epithelium
Pseudostratified epithelium
ciliated epithelium
Lungs have a large number of narrow tubes called
Alveoli
Bronchi
Bronchioles
Tracheae
Vocal cords occur in
Pharynx
Larynx
Glottis
Bronchial
During swallowing, glottis can be covered by a thin elastic cartilaginous flap called …A… to prevent the entry of food into larynx. Trachea is a straight tube extending up to …B… cavity, which divides at the level of 5th thoracic vertebra into right and left primary …C…
Choose the correct option for A, B and C from the given four options to complete the above statement with reference to NCERT textbook
epiglottis, mid-thoracic, bronchi
glottis, abdominal, bronchioles
epiglottis, thoracic, alveoli
uvula, mediastinum, alveolar ducts
