Lymphoid Organs

What are the primary Lymphoid organs (birthplace)?

Bone Marrow & Thymus

What are the secondary Lymphoid organs?

Lymph nodes, spleen, Tonsils, Aggregated Lymphoid nodules, & Appendix

What are Lymphoid Organs designed to?

gather & destroy infectious microorganisms and to store lymphocytes

Thymus 

A site where immature lymphocytes develop into T lymphocytes 

What does the Thymus secrete?

Thymic hormones

When is the thymus most active?

In childhood

What are the Lymph Nodes functions?

Most antigenic challenges occur in the Lymph nodes

Antigens are destroyed & activate B & T lymphocytes

Spleen 

largest lymphoid organ 

What are the Spleen's two main blood-cleansing functions?

1) Removal of bloodborne antigens

2) Removal & Destruction of old/defective blood cells

Spleen is the site for what?

hematopoiesis in the fetus &

B cell maturation into plasma cells

What does the Spleen storage?

platelets

Spleen White pulp

thick sleeves of lymphoid tissue 

What does the spleen white pulp provide?

the immune function of the spleen

Spleen Red pulp

surrounds white pulp

What is the Spleen responsible for?

disposing of the worn-out RBCs

Tonsils 

simplest lymphoid organs 

What are the four group of Tonsils?

Palatine, Lingual, Pharyngeal, & Tubal

What does the Tonsils do?

arranged in a ring to gather & remove pathogens

Tonsilitis

inflammation of the tonsils

What is Tonsillitis caused by? 

common viruses or bacterial infections 

What is the most common cause of Tonsillitis?

Streptococcus pyogenes