Chapter 9.4: Lymphatic System Flashcards

1
Q

In terms of the circulatory system, how does the lymphatic system play a role?

A

the lymphatic system consists of an extensive network of ONE WAY VESSELS for returning the remaining interstitial fluid to the blood.

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2
Q

___ ____ vessels permeate almost every tissue of the body.

A

initial lymphatic vessels

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3
Q

how are one way valves created in lymph vessels?

A

the endothelial cells forming the walls of the intiial lymphatic vessels slightly overlap like shingles on a rood, with their overlapping edges being free instead of attatched to the surrounding cells. This creates one way valve like openings

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4
Q

Once ___ ___ enters a lymphatic vessel, its called lymph

A

INTERSTITIAL FLUID

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5
Q

What prevents lymph from escaping the initial lymphatics?

A

Fluid pressure on the INSIDE. they force the overlapping endothelial cells together, closing the valves so that lymph does not escape.

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6
Q

Initial lymphatics converge to form larger and larger ___ ___, which eventually empty where?

A

larger lymph vessels, which eventually empty into the venous system near the point where the blood enters the right atrium.

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7
Q

In all amphibians and reptiles, they have ___ __ that create lymph flow back to the blood. Humans and mammals however o not have this. What two mechanisms allow for proper lymph flow?

A

In all amphibians and reptiles, they have LYMPH HEARTS that create lymph flow back to the blood.

Two mammalian mechanisms for lymph propagation

1) Lymph pump: lymph vessels are surrounded by smooth muscle. the smooth muscle is MYOGENIC, which contracts rhythmically as a result of myogenic initiation of action potentials.
2) lymph vessels lie between skeletal muscles, contraction of EXTRINSIC muscles squeezes the lymph out of the vessels.

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8
Q

In addition to returning lymph to blood, what additional functions does this system have?

A

has additional functions related to immune defense and transport of fat.

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9
Q

Fluid pressure on the OUTSIDE of the vessel ____ the endothelial cell’s free edge inward, permitting ____ of interstitial fluid.

Fluid pressure on the INSIDE of the vessel forces the overlapping edges ____ so that lymph cannot escape.

A

Fluid pressure on the OUTSIDE of the vessel PUSHES the endothelial cell’s free edge INWARD, permitting ENTRANCE of interstitial fluid (into the vessel)

Fluid pressure on the INSIDE of the vessel forces the overlapping edges TOGETHER so that lymph cannot escape.

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10
Q

lymph nodes play a role in

A

immune defense

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