Activation of both humoral and cellular immunity

Complement-mediated lysis

Direct killing of infected cells

Phagocytosis

Antigen neutralization

T cell differentiation     

Antigen presentation

Collecting circulating antigen   

B cell division              

autoimmune diseases would be likely to result

NK cells would be non-functional

T cells would not be activated by antigens presented by antigen-presenting cells.

Monocytes would not be able to migrate into infected tissue and differentiate into macrophages

It is involved in sound production and closing the glottis during swallowing

A and C are true

It is part of the respiratory zone. 

None of the above is true

The trachealis is the elastic ligament that connects the posterior open portion of the tracheal cartilaginous rings. 

Their receptors will bind to only one antigen

They require co-stimulation from an activated T helper cell

They are a first line of defense that can begin killing pathogens immediately

They produce memory cells when activated

less permeable than blood capillaries

as permeable as blood capillaries

completely impermeable

more permeable than blood capillaries

Tolerate more pressure than the blood capillaries

Ethmoid

Frontal

Maxillary

Nasal bones

IFN is a defensive mechanism that enhances the effectiveness of the innate and adaptive defenses.

IFN stimulates the activation of genes that produce anti-viral proteins in nearby cells.

Virally infected cells can release interferon to activate complement.

IFN will attract more viruses to the infected cell to destroy them.

IFN can penetrate the viral capsid and destroy the virus.

have lymphocytes

develop regulatory T cells 

directly fight antigens

have a cortex and medulla