- Slides: 11
Lymphatic System and Thyroid Gland
• Many different organs and systems work together in an effort to keep us alive and healthy. • In this ongoing struggle, the lymphatic system plays a central role; it has an extensive drainage network that helps to: - keep bodily fluid levels in balance; - defends the body against infections, and - assists in tissue repairs.
The production, maintenance and distribution of lymphocytes; WHITE BLOOD CELLS (WBCs) Basic Overview – The Lymphocytes (WBCs), protect the body against antigens (viruses, bacteria, etc. ) that invade the body. – Lymphocytes are produced and stored within lymph organs, such as: • The spleen, • The thymus and • The bone marrow. Lymphocytes must be specifically made to defend any new or known invader that enters the body.
• The return of fluid and solutes from the peripheral tissues of the blood. – “Lymph” is the liquid that “baths” every cell in the body. This fluid, called Interstitial Fluid, is the transport mechanism. – Lymph Nodes areas within the body that collect waste proteins (antigens, broken up cells) and dispose of them.
The Three Main Components of the Three Main Lymphatic System • 1. Vessels- – A network of lymph vessels (like blood lymph vessels) start from the peripheral (outside) tissues and move internally towards local areas of “holding, digestive sites” – Lymph Nodes.
• 2. Fluid – LYMPH – The Lymph is clear and watery. It flows through the lymphatic vessels. – Lymph Fluid contains: • Fluid from the intestines (chyme), which contains proteins and fats. • RBCs. • WBCs, especially lymphocytes, the cells that attack bacteria in the blood.
• 3. Lymphoid organs– Lymphoid organs are connected to the lymphatic vessels and contain large numbers of lymphocytes. • (Ex. Lymph nodes, spleen and thymus).
– Lymph organs = bone marrow, lymph nodes, spleen, and thymus. – Human lymph nodes, called lymph glands and “swollen glands, ” are bean-shaped and range in size from a few millimeters to about 1 -2 cm in their normal state. – They may become enlarged due to a tumor or infection. (Where does a doctor check first? ) – White blood cells are located within honeycomb structures of the lymph nodes. – Spleen- The spleen, which is located in the upper left part of the abdomen under the ribcage, works as part of the lymphatic system to protect the body. It clears worn out red blood cells and other foreign bodies from the bloodstream to help fight off infection.
• Tonsils—The tonsils areas of lymphoid tissue on either side of the throat. • Thymus- an organ located in the upper anterior portion of the chest cavity just behind the sternum. • Hormones produced by this organ stimulate the production of certain infectionfighting cells.
• Through the hormones it produces, the thyroid gland influences almost all of the metabolic processes in your body. • Thyroid disorders can range from a small, harmless goiter (enlarged gland) that needs no treatment to life-threatening cancer. • The most common thyroid problems involve abnormal production of thyroid hormones. • Too much of these vital body chemicals results in a condition known as hyperthyroidism. • Insufficient hormone production leads to hypothyroidism. Reinforcement Video