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Week 3 Discussion
Endocrine, Lymphatic, Cardiovascular
| Term | Definition |
|---|---|
| Pituitary Gland | "Master Gland" lobes that secrete hormones controlling growth, reproduction, and other glands |
| Thyroid Gland | Produces thyroxine (T4) and triiodothyronine (T3), regulating metabolism |
| Parathyroid Glands | Secrete parathyroid hormone (PTH) to regulate calcium levels |
| Adrenal | the cortex produces steroid hormones like cortisol and aldosterone, while the medulla secretes adrenaline and norepinephrine |
| Pancreas | Has both endocrine (insulin, glucagon) and exocrine functions |
| Lymphatic Vessels | Open-ended capillaries that collect lymph and transport it toward larger vessels |
| Lymph Nodes | Small, bean-shaped structures (about 500–600 in humans) that filter lymph and house immune cells |
| Primary Lymphoid Organs | Bone marrow and thymus, where lymphocytes (B and T cells) mature |
| Lymph Ducts | Large vessels (e.g., thoracic duct, right lymphatic duct) that carry lymph to the venous system |
| Secondary Lymphoid Organs | Sites like spleen, tonsils, and lymph nodes where mature lymphocytes gather to mount immune responses |
| Myocardium | The muscular tissue of the heart. |
| Endocardium | Inner lining of the heart chambers. |
| Pericardium | Protective sac surrounding the heart. |
| Atria | Upper chambers of the heart. |
| Ventricles | Lower chambers of the heart. |