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BIOS255 Week 4 Lymphatic System
Learning Objectives:
State the components and functions of the lymphatic system
Trace lymphatic drainage through the major vessels of the lymphatic system.
Identify the mechanisms that cause movement of lymph through the lymph vessels.
Introduction:
The lymphatic system consists of lymphatic fluid, lymphatic vessels, lymphatic tissue, and
lymphatic organs located throughout the tissues of the body. It functions to drain excess
interstitial fluid from the tissues, to initiate an immune response against disease by producing
and transporting lymphocytes, and to transport dietary lipids absorbed by the gastrointestinal
tract into the blood. Lymphatic capillaries extend throughout the tissues of the body among
blood capillary beds. Interstitial fluid, similar in composition to blood plasma, leaches from the
blood capillaries into the surrounding tissue, bathing the cells and supplying each one with
nutrients, oxygen, and water while also removing waste, carbon dioxide, and water. Around 30
liters of fluid enter the arteriolar end of capillaries every day, but only 27 liters return to the
venous capillaries. The lymphatic system collects the missing 3 liters from the interstitial space
and returns it to the venous system. Let’s explore this system that can be found in so many
different places and perform multiple roles!
Assignment
Part 1:
Complete the activities on Anatomy.TV for the Lymphatic System and Immunity:
Introduction, Vessels and Circulation, Organs and Tissues.
To access Anatomy.TV:
Resources tab>Library>Library Resources-Database A-
Z>Anatomy.TV>Titles(default tab): Choose Lymphatic system and Immunity>choose
assigned sections
You will then work through the material and activities by scrolling down on the right. This
will allow you to see and work through all activities for that section.
As you complete the lab activities, have the lab report ready to record data.
Part 2:
Complete the lab report.
Lymphatic System Lab Report
1.
List the 4 components of the lymphatic system described in the
introduction. (1 point; 1/4 point each)
-The Lymphatic system consists of; Lymphatic fluid, lymphatic vessels, lymphatic tissue, and
lymphatic organs located throughout the tissues of the body.
2.
List 3 functions of the lymphatic system. (1.5 points total; 1/2 point each)
-Transport, Fluid balance and Immunity.
3.
List 3 secondary organs of the lymphatic system. (1.5 points; ½ point each)
-Diffuse Lymphatic tissue
-Spleen
-Lymph nodes
4.
List the 3 tonsils
and
indicate their locations. (3 points)
The Palestine tonsils lie at the posterior region of the oral cavity, between the glossopalatine
and pharyngopalatine arches.
The Pharyngeal tonsils are in the posterior wall of the nasopharyncx.
The Lingual tonsils are located on the posterior surface of the tongue.
5.
Identify structures in the following image from the Vessels and Circulation tab: you will
need to click on “Lymphatic Capillaries” (1/2 point each; 2.5 points total)
A.
Blood Capillaries
B.
Lymphatic Vessel
E
D
C
B
A
C.
Interstitial Fluid
D.
Lymphatic Anchoring Filaments
E.
Lymphatic endothelial cells
6.
Describe 2 ways in which the intestines play a role in the lymphatic system. (1 point)
--Defecation removes microbes from the body. Certain microbes may also trigger contraction of
the intestines to cause diarrhea.
7.
Describe the structure
and
function of the thoracic duct. (1 point)
-The Thoracic duct is about 38-45cm long and forms the largest confluence of lymphatic vessels
in the body. It receives lymph from the left side of the body as well as the lower right side.
8.
What are the 2 mechanisms that allow movement of lymph through the lymph
vessels? (1 point; ½ point each)
-
Skeletal and Respiratory muscle pumps
9.
If someone has their spleen removed surgically what could be the
clinical consequence? (1 point)
-Their body would not be able to break down and recycles old blood cells and produces white
blood cells, which fight infection.
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10.
Describe how the skeletal system plays an important role in the lymphatic
system. (1.5) point)
-
The Skeletal system plays an important role in the lymphatic system since the blood cell
formation system in our marrow is closely related to our lymphatic system. This system
is made up of the bone marrow, the spleen, and, in young people, the thymus. It is also
made up of lymph nodes, which are scattered throughout the body. Skeletal muscle
contractions move lymph through the vessels, which is why the skeletal system plays an
important role in the lymphatic system.
Grading Rubric for Lab Report
Activity
Deliverable
Points
Part 1
Complete lab activities
15
Part 2
Complete lab report
15
Total
Complete all lab activities
30
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