Master Immune System Tissues with Picmonic for Pre-Health

With Picmonic, facts become pictures. We've taken what the science shows - image mnemonics work - but we've boosted the effectiveness by building and associating memorable characters, interesting audio stories, and built-in quizzing.

Immune System Tissues

Moon with Tissues
There are a variety of organs and cells in the immune system that contribute to the body's defense against foreign particles. The bone marrow is the site of haematopoiesis, which results in the formation of B and T cells. B cells participate in the humoral immune response, while T cells participate in cell-mediated immunity. B cells began maturing in the bone marrow itself and finish becoming functional cells in the spleen. In contrast, T cells mature in the thymus where they are tested for self response. T cells are tested for autoimmunity to prevent released T cells from recognizing and attacking the body's own proteins and antigens.Both B and T cells reside in the lymph nodes, which are large organs spread throughout the body that filter and circulate lymph. Here, mature B and T cells monitor the lymph for pathogens and conduct their respective immune responses upon exposure to a foreign antigen. The spleen is a lymphatic organ where blood is filtered, and it is the site of B and T cells monitoring blood for pathogens.
Bone Marrow
Bone Marilyn-Monroe

The bone marrow is the location where immature B and T cells form. They develop from the stem cells located in the bone marrow.

B Cells and T Cells Formed
Baby Basketball and Tennis Ball in a Cradle

B and T cells are formed in the bone marrow from stem cells in a process called haematopoiesis.

B Cells Mature
Old Basketball

B cells reach a semi-mature level in the bone marrow before traveling to the spleen and becoming a fully-functional mature B cell.


The thymus is an immune system organ primarily involved in the maturation of T cells. It is located in front of the heart and behind the sternum.

T Cells Tested For Self-Response
Tennis-balls fighting each other

T cells are tested for self response in the thymus. Autoimmunity is when the body's immune cells attack the body itself, and to avoid this, T cells are tested for whether they attack the body's proteins and antigens.

T Cells Mature
Old Tennis-ball

T cells reach maturity in the thymus and are ready to destroy infected cells (cytotoxic and natural killer T cells) or assist by activating B and killer T cells (helper T cells).

Lymph Nodes

The lymph nodes are the garrisons of immunity cells. They are distributed throughout the body and linked by lymphatic vessels. They are filters and traps for foreign molecules.

Mature B Cells and T Cells Monitor Lymph For Pathogens
Old Basketball and Tennis-ball monitor Lime-juice for Pathogen

In the lymph nodes, mature B and T cells monitor the lymph circulating through for pathogens. B cells respond through antibody production, while cytotoxic and killer T cells destroy the pathogens.


The spleen is analogous to the large lymph nodes for blood filtration. It holds a reserve of blood in case of hemorrhage and filters red blood cells. In the immune system, it serves as a site of B and T cell activity.

Mature B Cells and T Cells Monitor Blood For Pathogens
Old Basketball and Tennis-ball monitor Blood for Pathogen

In the spleen, mature B and T cells look for pathogens and bind to any free floating antigens. They then trigger the humoral adaptive immune response and the cell-mediated adaptive immune response.

Unlock all 10 facts & definitions with Picmonic Free!

Take the Immune System Tissues Quiz

Picmonic's rapid review multiple-choice quiz allows you to assess your knowledge.

It's worth every penny

Picmonic for Pre-Health Covers

Our Story Mnemonics Increase Mastery and Retention

Memorize facts with phonetic mnemonics

Unforgettable characters with concise but impactful videos (2-4 min each)

Ace Your Pre-Health Classes & Exams with Picmonic:

Over 1,240,000 students use Picmonic’s picture mnemonics to improve knowledge, retention, and exam performance.

Choose the #1 Pre-Health student study app.

Picmonic for Pre-Health covers information that is relevant to your entire Pre-Health education. Whether you’re studying for your classes or getting ready to conquer the MCAT, we’re here to help.

Works better than traditional Pre-Health flashcards.

Research shows that students who use Picmonic see a 331% improvement in memory retention and a 50% improvement in test scores.