The …………connects the larynx with the main bronchi.

The …………. is the blood component that transports the oxygen from the lung to the tissue cells.

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

Which one of the following processes DOES NOT occur during inspiration?

Why the trachea and main bronchi are supported by hyaline cartilage rings?

This immune cell kills target pathogen by apoptosis via secreting perforin and granzyme.

The nasal septum divides the nasal cavity into two compartments. The ……… bone makes the superior part of the nasal septum:

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.

Which one of the following is part of the innate immunity second line of defense?

When the TCR and CD4 coreceptor on T helper cell bind the antigen on MHC class molecule on the APC, the APC will transmit (a/an) ……………………. signal to the T helper cell.