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Lesson Plan
• PowerPoint Presentation
• Present Model
• Take Quiz
• Take Test
The Lymphatic
System
Created By:
Kyle Willour and Noah Sanchez
Role
• The Lymphatic system plays an
important role in immunity
• Three principle functions:
1.
Collect and return tissue fluid to
blood
•
•
2.
3.
Preserves fluid balance
Collects roughly 10% of the
interstitial fluid, or tissue fluid,
and protein that accumulates in
the fluid.
Defend body against disease
organisms
Absorb lipids from digestive
system
• Offshoot of the Circulatory
system and works with the
Immune system
• Does NOT help the body heal
itself from injuries or toxins in the
air
Make Up
• Composed of:
–
–
–
–
Lymphatic Vessels
Lymph Tissue
Lymph Organs
Lymph
• Clear Fluid
• Tissue fluid that has entered
the Lymph capillaries
• From Latin Lympha, meaning
“Water Goddess”.
• Tiny capillaries with dead
ends
– Extends into all tissues of the
body
Lymph Nodes
• Lymph nodes
– Small organized mass of Lymph Tissue
– Functions:
• Filter Lymph as it passes through
• Produce Lymphocytes
– Most numerous in neck, under arms, groin, and
chest region
Lymph Nodes (Cont.)
• Lymph nodes can become swollen
• Swell for various diseases and infections
– Anything from throat infections to terminal cancer
– Swell because of an increase in Lymphocytes
Lymphocytes
•
•
Lymphocytes are the white blood cells inside
the Lymph node
Two primary types of Lymphocytes:
1.
B cells
•
•
2.
B cells are responsible for the production of
antibodies
Antibodies leave the node to track down
and mark antigens for destruction
T cells
•
•
Each cell is specialized to kill one type of
virus
Two main types of cells
–
–
•
•
Killer T cells
»
Coordinate the attacks on
viruses and other foreign
microorganisms
Helper T cells
»
Attack and destroy viruses
and other foreign
microorganisms
Work with Macrophages
Most Lymphocytes live for a max of a
couple of months but some can survive
for years
–
These cells have a “memory” of past
antigens and as a result can offer a more
rapid and vigorous response
How It Works
•
•
Blood travels through arteries throughout the
body
Hydrostatic pressure, or blood pressure, forces
plasma and small proteins out of the blood
vessel into the surrounding tissue
–
–
–
•
Becomes tissue fluid
This fluid is rich in amino acids, salts, glucose, and
oxygen
Acts as a nourishing bath for the tissue
Lymphatic vessels absorb tissue fluid
–
–
Becomes Lymph
Only absorbs about 10%
•
•
Lymphatic vessels take the Lymph through the
Lymph nodes where it gets filtered for
pathogens
–
•
Other 90% is reabsorbed through the veins by
Osmotic pressure
Lymph travels through the Lymph system by the
pulsating of the Lymph veins
Lymphatic ducts, specifically the Thoracic duct,
bring the Lymph to the left subclavian vein in
the neck where it is returned to blood
circulation.
–
All Lymph moves in one direction only
Bib page
• The Naked Scientists." How The Lymphatic System
Works -. N.p., n.d. Web. 04 Mar. 2014.
• "LYMPHATIC SYSTEM AND IMMUNITY." Lymph
and Immunity. N.p., n.d. Web. 04 Mar. 2014.
• Zimmermann, Kim Ann. "Lymphatic System:
Facts, Functions & Diseases." LiveScience.
TechMedia Network, 08 Feb. 2013. Web. 03 Mar.
2014
• "Immune and Lymphatic Systems." InnerBody.
N.p., n.d. Web. 04 Mar. 2014.
• N.p., n.d. Web.