The circulatory and lymphatic systems are networks of vessels and a pump that transport blood and lymph, respectively, throughout the body. When these. Lymphatic system, a subsystem of the circulatory system in the vertebrate The portion of blood plasma that escapes is called interstitial or. If you're like most people, you're more familiar with how the heart and blood vessels work together as part of the cardiovascular system — but.
In humans the thymus and bone marrow are the key players in immune function. All lymphocytes derive from stem cells in the bone marrow.
The Lymphatic System
Stem cells destined to become B lymphocytes remain in the bone marrow as they mature, while prospective T cells migrate to the thymus to undergo further growth. Mature B and T lymphocytes exit the primary lymphoid organs and are transported via the bloodstream to the secondary lymphoid organs, where they become activated by contact with foreign materials, such as particulate matter and infectious agents, called antigens in this context.
Thymus The thymus is located just behind the sternum in the upper part of the chest.
It is a bilobed organ that consists of an outer, lymphocyte-rich cortex and an inner medulla. The differentiation of T cells occurs in the cortex of the thymus.How Lymphatic System Works Animation: Spreading of Breast Cancer - Pathophysiology of Edema Video
In humans the thymus appears early in fetal development and continues to grow until pubertyafter which it begins to shrink. The decline of the thymus is thought to be the reason T-cell production decreases with age. The thymocytes then move to the medulla of the thymus, where further differentiation occurs.
Positive and negative selection destroy a great number of thymocytes; only about 5 to 10 percent survive to exit the thymus. Those that survive leave the thymus through specialized passages called efferent outgoing lymphatics, which drain to the blood and secondary lymphoid organs.
Circulatory and Lymphatic System by caoimhe lyons on Prezi
The thymus has no afferent incoming lymphatics, which supports the idea that the thymus is a T-cell factory rather than a rest stop for circulating lymphocytes. Bone marrow In birds B cells mature in the bursa of Fabricius.
- What is the relationship between lymph and blood?
- Comparison of Blood and Lymph Vessels
- Lymphatic system
The process of B-cell maturation was elucidated in birds—hence B for bursa. Lymph capillaries represent the beginning of the lymphatic drainage system and originate in close proximity to blood capillaries. Lymph capillaries resemble blood capillaries but have a more irregular cell structure, and their walls are more permeable than those of blood capillaries.
Because of their unique structure, lymph capillaries are able to absorb larger particles from the tissues, such as proteins, cells, bacteria and other large substances, which cannot be absorbed by blood capillaries. On its way back to the blood, lymphatic fluid travels through a successive number of lymph nodes, which filter out impurities from the lymph.
Main Differences between Blood and Lymph Vessels The circulatory system represents a closed system with the heart as its central motor, and blood and blood vessels as the other structural elements. The main purpose of the blood vessels is the uninterrupted supply of all body tissues with nutrients and oxygenated blood, and the removal of metabolic waste and carbon dioxide from the tissue cells.
The part of the circulatory system that delivers blood to and from the lungs is known as the pulmonary circulation, and the flow of blood throughout the rest of the body is administered by the systemic circulation.
Relationship between the Cardiovascular System and Lymphatic by Cameron Jones on Prezi
The lymphatic system and its vessels do not form a closed circulatory system. It begins with small lymphatic vessels lymph capillaries in the body tissues, and continues with successively larger lymphatic vessels collectors and trunkswhich ultimately connect to the venous part of the blood circulatory system. There is no central pump, lymph vessels produce their own propulsion system with a network of smooth musculature located in the walls of lymph collectors and trunks.
Since the lymph vessels work according to the one-way principle and not as a closed circulatory system, it is more appropriate to speak of lymph transport rather than lymph circulation.