The pressure inside the lungs:

Lymph is a fluid that is most similar to

____________ receptors are specialized receptors within the nasal cavity that detect odor.

The trachea bifurcates into:

This cell type is embedded in the respiratory epithelium and is responsible for secreting mucin: 

MHC class 2 presents antigens to which cell?

The lower limbs are drained by the 

These structures belong to the lower respiratory system:

HIV may infect immunologic memory cells and create several reservoirs of latent HIV in these quiescent cells. (in these cells, the provirus lays dormant as its replication is halted).

Cell-mediated and antibody-mediated immunities are parts of our innate immunity. The proper functioning of these CMI and AMI branches rely on the activity of helper T-cells (CD4-T cells).