10 Questions
What is the primary function of lymphatic capillaries?
To collect and filter interstitial fluid
Which type of immune response involves the activation of cytotoxic T cells and macrophages?
Cell-mediated immunity
What is the name of the largest lymphatic vessel that returns lymph to the bloodstream?
Thoracic duct
Which type of leukocyte is responsible for producing antibodies against pathogens?
Lymphocyte
What is the term for the process by which the immune system distinguishes between self and non-self?
Self-tolerance
Which type of immunity is acquired through exposure to a pathogen or vaccine?
Adaptive immunity
What is the term for the movement of white blood cells out of the bloodstream and into tissues?
Diapedesis
Which type of immune cell is responsible for presenting antigens to T cells?
Dendritic cell
What is the term for the process by which the immune system eliminates or reduces the severity of an infection?
Resolution
Which type of lymphocyte is responsible for cell-mediated immunity?
T cell
Study Notes
Reticular Connective Tissue
- Reticular connective tissue contains macrophages and lymphocytes (B cells and T cells) as white blood cells.
- The purpose of reticular connective tissue is to filter foreign substances, such as pathogens and debris.
- The netlike organization of reticular fibers traps pathogens and debris, preventing them from moving further.
- White blood cells in the reticular connective tissue interact with and destroy pathogens and debris.
Lymphatic Organs
- The lymphatic organs include lymph nodes, tonsils, spleen, and thymus gland.
- The thymus gland is the only lymphatic organ that does not contain reticular connective tissue, as it does not have a role in filtering foreign substances.
Lymph Nodes
- Lymph nodes are small, bean-shaped masses located between lymphatic vessels.
- They are found throughout the body, and can also exist in groups, especially in the neck, armpit, and groin.
- Lymph nodes participate in immunity, which is the resistance to disease, achieved by the leukocytes (white blood cells) of the body.
Lymphatic Vessels
- The lymphatic system begins with lymphatic capillaries, which are the smallest lymphatic vessels.
- Lymphatic capillaries differ from blood capillaries in two major ways:
- They lack a basement membrane.
- The endothelial cells overlap, allowing for unidirectional flow of fluid into the lymphatic capillary.
- Lymphatic capillaries are more permeable than blood capillaries, allowing small molecules and large substances to move from the interstitium into the lumen of the lymphatic capillary.
Immunity
- Immunity is the resistance to disease, achieved by the leukocytes (white blood cells) of the body.
- The immune system can also function as part of the lymphatic system.
- Types of immunity include innate immunity and acquired immunity.
- Acquired immunity can be active or passive, and can be naturally or artificially acquired.
Learn about the functions and components of reticular connective tissue and lymphatic organs, including their roles in filtering foreign substances and immune responses.
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