FINAL_LABS_BIOS255_Labs_BIOS255_Week_4_Lymphatic_system
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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)
Lymph, lymphatic vessels, lymphatic tissue, and lymphatic organs
2.
List 3 functions of the lymphatic system. (1.5 points total; 1/2 point each)
Fluid balance, immunity, and transport
3.
List 3 secondary organs of the lymphatic system. (1.5 points; ½ point each)
Diffuse lymphatic tissue, spleen, and lymph nodes
4.
List the 3 tonsils
and
indicate their locations. (3 points)
Palatine tonsils:
posterior region of the oral cavity (between glassopalatine and phayrngopalatine arches)
Pharyngeal tonsils:
posterior wall of nasopharynx
Lingual tonsils:
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.
Arteriole
B.
Lymphatic Capillary
C.
Anchor Filaments
D.
Lymphatic Capillary Pore
E.
Lymphatic Vessel Cell
6.
Describe 2 ways in which the intestines play a role in the lymphatic system. (1 point)
E
D
C
B
A
The intestines help carry fats and vitamins into the lymphatic system, and they also play a big part in the body's immune system. 7.
Describe the structure
and
function of the thoracic duct. (1 point)
38-45 cm long and forms the largest confluence of lymphatic vessels in the body
Receives lymph from the left side and lower right side of the body
Originates at the cisterna chyliform; there it descends the thorax to the left of the vertebral column; then joins with vessels from the neck and empties into the left subclavian vein at its junction with the internal jugular vein
8.
What are the 2 mechanisms that allow movement of lymph through the lymph vessels? (1 point; ½ point each)
Muscular contractions and one-way valves
9.
If someone has their spleen removed surgically what could be the clinical consequence? (1 point)
Removing the spleen could lead to an increased risk of infections and a reduced ability to filter and remove old or damaged blood cells from circulation.
10.
Describe how the skeletal system plays an important role in the lymphatic system. (1.5) point)
The skeletal system provides a structural framework for the lymphatic vessels to follow, promoting the movement of lymph and aiding in the proper functioning of 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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