Lec9 Lymphatic System

Lec9 Lymphatic System - Chapter 7 Lymphatic System and...

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 7 Lymphatic System and Immunity
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 functions of the lymphatic system Lymphatic capillaries absorb excess tissue fluid and return it to the bloodstream Lymphatic capillaries (lacteals) in the small intestine absorb fats associated with proteins Works in the production, maintenance and distribution of lymphocytes in the body Helps in defense against pathogens
Background image of page 2
What are the components of the lymphatic system?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Lymphatic vessels One-way valve system that carries fluid called lymph Made of capillaries, vessels and ducts Function to return tissue fluid (includes water, solutes and cell products) to the bloodstream The larger vessels are similar in structure to veins and even have valves
Background image of page 4
Classifying lymphatic organs Primary Red bone marrow Thymus gland Secondary Lymph nodes and spleen
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Primary lymphatic organs Red bone marrow Site of blood cell production More bones in children have red marrow and it decreases as we age Some white blood cells mature here Red bone marrow in adults, skull, ribs, clavicle, pelvis, vertebrae
Background image of page 6
Primary lymphatic organs Thymus gland Bilobed gland found in the thoracic cavity superior to the heart Largest in children and shrinks as we age Immature T lymphocytes move from the marrow to the thymus where they mature and 95% will stay
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Secondary lymphatic organs Lymph nodes Small, oval-shaped structures found along the lymphatic vessels filled B cells, T cells and macrophages Common in the neck, armpit and groin regions
Background image of page 8
Is located in upper abdominal cavity just below diaphragm Acts as a blood reservoir Spleen nodules contain macrophages and lymphocytes help purify blood Filled with white pulp containing lymphocytes and red pulp is involved with filtering the blood Spleen Secondary lymphatic organs
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Fig. 7.8-1c Small, oval-shaped structures found along the lymphatic vessels filled B cells, T cells and macrophages Common in the neck, armpit and groin regions Nodules can also exist outside of lymph nodes e.g. tonsils, adenoids, Peyer’s Patches Lymph is purified at these sites. Secondary lymphatic organs Lymph nodes
Background image of page 10
We Are Constantly Bathed in Microorganisms Most are harmless Immune system protects us against pathogens microorganisms that can invade our bodies and cause disease Immunity can be specific or non-specific
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What do the nonspecific defenses include? First line of defense : Barriers to entry: physical and chemical Second line of defense : Phagocytic white blood cells Inflammatory response Protective proteins: complement and interferons
Background image of page 12
The first line of defense Physical barriers Skin Tears, saliva and urine physically flush out microbes Mucous membranes line the respiratory, digestive, reproductive and urinary tracts Resident bacteria/normal flora that inhabit the body use available nutrients and space thus preventing pathogens from
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/07/2009 for the course BIOL 115 taught by Professor Irving during the Spring '08 term at Illinois Tech.

Page1 / 47

Lec9 Lymphatic System - Chapter 7 Lymphatic System and...

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online