Lymphocytes develop and mature in the secondary lymphoid organs and are activated by antigen-presenting cells in the primary lymphoid organs, such as the thymus.

The innate immune cells recognize and eliminate the pathogens via the interaction of the PRRs on the immune cells with the PAMPs on the pathogens.

The ……………. functions like a lid that covers the larynx to prevent food and water from entering the respiratory system.

Which one of the following medical terminologies stands for coughing blood?

Which one of the following immune cells secretes antibody to eliminate the infective pathogens?

The horizontal and oblique fissures divide the lungs into lobes; three lobes in the left lung and two lobes in the right lung.

Which one of the following respiratory processes DOESN’T cause exhalation of the air from the lung?

Which muscle of the following facilitates the quiet respiration?

The most superior part of the pharynx known as the ……… contains the pharyngeal tonsils, and functions as an air passage only.

The respiratory membrane that lines the lung alveoli and facilitate gas exchange is mainly made of ……………….