Lymphatic system notes, Study notes of Pharmacy

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LYMPHATIC SYSTEM

B.PHARM 1ST SEMESTER

Introduction

The lymphatic system is a part of the circulatory and immune system.

• It helps in removal of waste, transport of lymph, and defense against infection.

Lymph

Definition: Lymph is a clear, colorless fluid formed from tissue (interstitial) fluid and carried through lymphatic vessels. It contains lymphocytes, proteins, and fats.

• Function:
• Returns excess tissue fluid to blood circulation
• Transports lymphocytes
• Removes waste materials
• Carries absorbed fats from intestine

Lymphatic Capillaries

• Definition: Lymphatic capillaries are minute, thin-walled vessels present in tissues that collect interstitial fluid.
• (^) Function:
• Absorb excess tissue fluid
• Initiate lymph formation

Major Lymphatic Organs

• Lymph nodes
• Spleen
• Thymus
• Tonsils

Lymph Nodes

Definition: Lymph nodes are small, bean-shaped structures located along lymphatic vessels.

• Function:
• (^) Filter lymph and remove pathogens
• (^) Produce lymphocytes
• (^) Activate immune response

Thymus

• (^) Definition: The thymus is a bilobed lymphatic gland located behind the sternum.
• (^) Function:
• Maturation of T-lymphocytes
• Development of immune system
• (^) Most active in childhood

Tonsils

Definition: Tonsils are masses of lymphoid tissue located in the throat region.

• (^) Function:
• (^) Trap microorganisms entering through mouth and nose
• (^) Produce antibodies
• (^) Provide local immunity