Module 3 Flashcards
What does the lymphatic vessels transport?
Fluids that have escaped from the blood vascular system back to the blood.
Lymphatic System actually consists of two semi-independent parts:
1) a meandering network of lymphatic vessels
2) various lymphoid tissues and organs scattered throughout the body
What are lymphoid organs essential roles?
Body defence and resistance to disease.
What does lymphoid organs house?
Phagocytic cells and lymphocytes.
The hydrostatic and osmotic pressures operating at capillary beds force fluid out of the blood at the arterial ends of the capillary beds (down stream) and cause most of it to be reabsorbed at the venous ends (up stream). True or False
False. (up stream) to (down stream)
If the leaked fluid from the bloodstream, does not get carried back to the blood what happens?
The fluid accumulates in the tissues, producing edema, which, if excessive, impairs the ability of tissue cells to make exchanges with the interstitial fluid and ultimately the blood.
What is the function of the lymphatic vessels is?
To pick up this excess tissue fluid, now called lymph (lymph = clear water) and return it to the bloodstream.
Are the lymphatic vessels a one way system?
Yes
Where does lymph flow to?
Only towards the heart.
Lymph vessels are lined by ________ cells, and have a thin layer of smooth muscles, and _______ that bind the lymph vessels to the surrounding tissue.
Endothelial and adventita
What is adventita? And what is it also called?
The outermost CT covering of an organ, vessel or other structure. It is also called the tunica adventita or the tunica externa.
What does the lymph capillaries absorb?
Leaked fluid (primarily water and a small amount of dissolved proteins)
Where do lymph capillaries spiderweb?
Between the tissue cells and blood capillaries in the loose CTs of the body.
Explain why and how the endothelial cells forcing flaplike-mini values that act as one-way swinging doors.
The flaps gape open when the fluid pressure is higher in the interstitial space, allowing fluid to enter the lymphatic capillary. However, when the pressure is higher inside the lympathic vessels, the endothelial cell flaps are forced together, preventing the lymph from leaking back out and forcing it along the vessel.
What are normally prevented from entering blood capillaries, but enter the lymphatic capillaries easily, particularly in inflamed areas? And what is the problem with that?
Proteins and even larger particles suck as cell debris, bacteria and viruses. The problem is that bacteria and viruses and cancer cells that enter the lymphatics can then use them to travel throughout the body.
