MICROBIOLOGY – ALCAMO

LECTURE:

Immune System, Lymph Node

Introduction

The Lymphatic System

• The _______________________ defends the body from foreign invasion by disease causing agents such as viruses, bacteria, or fungi.

The Lymphatic System

• Part of the immune system made of a network of __________________that carry a clear fluid called _________ in one direction - _____________________

• Also includes structures dedicated to the circulation and production of lymphocytes (_________, _________, _____________, __________________, _________, etc)

The Lymphatic System• Blood does not directly come in

_________ with the cells and tissues in the body

• Parts of the blood first exit the blood vessels to become _________________, which comes into contact with the cells of the body.

• _________ is formed when interstitial fluid enters the initial _______________

The Lymphatic System

• _________ and _________ interstitial fluid, including plasma protein to the blood, and thus helps maintain fluid balance 

• _________ the body against disease by producing lymphocytes

• _________ lipids from the intestine and transport them to the blood

Lymph Node

• __________________________________distributed widely throughout the body including the armpit and stomach/gut and linked by lymphatic vessels

• __________________ are found all through the body, and act as _________ or traps for foreign particles

• They are important in the proper functioning of the __________________

Lymph Node StructureA. Pericapsular Connective Tissue and Fat

Tissue which clings to outside of node, holds

node _________, _________it, ready supply of

_________ for energy

B. Capsule• Dense outer covering which ________________

• ________________ – inner branches of capsule

C. The Substance of the lymph node is divided into:

• __________________

• __________________

D. Germinal Centers

• Dense, darkly stained round areas just inside the capsule where certain

___________________________

Vessels

• Multiple _________ lymph vessels bring _________ into the _________________

• The _________ gets slowly _________ through the substance of the lymph node where it encounters ___________

• The _________ lymph vessel carries the lymph ____________________________

VesselsA. Artery

– __________________________________from heart to node

– Has a _______________ and quite small inside diameter

– May contain visible _________________

VesselsB. Vein

– Carries __________________from node to heart

– Has a __________________and larger inside diameter than the artery

– May contain visible blood cells

Vessels

C. Lymph– Has almost _________

_________– Has a very large

inside _________

– Never contains _________ blood cells

Maintain the pressure and volume of extracellular fluid by returning excess water and dissolved substances from the interstitial fluid to the circulation