(i) Mammals have negative pressure breathing. (ii) The impulses for voluntary breathing are sent by the medulla oblongata. (iii) The trachea, primary, secondary and tertiary bronchi, and initial bronchioles are supported by incomplete cartilaginous rings. (iv) The volume of air remaining in the lungs even after a forcible expiration is functional residual capacity. How many of the above statements are correct?

Question

(i) Mammals have negative pressure breathing. (ii) The impulses for voluntary breathing are sent by the medulla oblongata. (iii) The trachea, primary, secondary and tertiary bronchi, and initial bronchioles are supported by incomplete cartilaginous rings. (iv) The volume of air remaining in the lungs even after a forcible expiration is functional residual capacity. How many of the above statements are correct? (A) Two (B) Three (C) One (D) Four

Tardigrade Admin · Accepted Answer

i. Reptiles, birds and mammals possess negative pressure breathing.
ii. The impulses for voluntary breathing are sent by the medulla oblongata.
iii. The primary, secondary and tertiary bronchi are supported by incomplete cartilaginous rings.
iv. The volume of air remaining in the lungs after a normal expiration is known as functional residual capacity (FRC). It includes expiratory reserve volume (ERV) and residual volume (RV). ERV is the maximum volume of air that can be exhaled after a normal expiration. It is approximately 1000–1500 mL.