Unit 3-Lymphatic System Worksheet

Question 1

Describe the lymphatic vessels.

Answer 1

Vessels that contain lymph and collect at the back of the heart
flow in one direction

Question 2

What is the purpose of lymphatic vessels?

Answer 2

Returning fluid back to the bloodstream

Question 3

What kind of cells are CONTAINED within lymphoid tissues & organs?

Answer 3

• Phagocytic cells

- lymphocytes

Question 4

What is the purpose of lymphoid tissues and organs?

Answer 4

An immune purpose

Question 5

T/F: In regards to lymphoid tissues & organs, only filtering of blood occurs.

Answer 5

False, some filtering for blood and some filtering of lymph occurs

Question 6

Describe lymph.

Answer 6

• Fluid in the lymphatic system; mechanism used to get blood back into the bloodstream
• this fluid will leak out of capillaries and end up in interstitial space and then leak into lymphatic capillaries

Question 7

Describe what lymph is contained in.

Answer 7

Lymph is contained within the vessels

Question 8

Identify another substance that lymph is similar to

Answer 8

Lymph is a fluid that is similar to plasma

Question 9

Describe the movement of lymph

Answer 9

Will be drained by veins and then return to circulation

Question 10

What are the components of the lymphatic system?

Answer 10

• Lymphoid tissues & organs
• lymph
• lymphatic vessels

Question 11

Describe the fluid that can be found in interstitial. (Hint: answer in context of lymphatic vessels)

Answer 11

• Fluid from interstitial space gets into lymphatic system and then will be pushed under low pressure
• All of the fluid will then collect near the back of the heart

Question 12

Where will the lymphatic vessels connect to blood vessels?

Answer 12

Near the back of the heart

Question 13

What marcomolecule can be found in the fluid in interstitial space?

Answer 13

Proteins

Question 14

What happens to the protein rich fluid that is in the lymphatic vessels?

Answer 14

The protein rich fluid that get into the lymphatic vessels will eventually get dumped into the circulatory system.

( This flow describes how we get proteins into circulation)

Question 15

What does the protein rich fluid create?

Answer 15

• Osmotic pressure, this pressure helps in the regulation of fluid that moves in and out of the blood capillaries.
• Maintaining blood volume (blood volume links back to blood pressure)

Question 16

T/F: Lymphatic vessels do not have a pump and function under super high pressure.

Answer 16

False: Lymphatic vessels do not have a pump BUT they function under LOW pressure

Question 17

Describe the composition of lymphatic capillaries.

Answer 17

• Small single cell layer of loosely overlapping endothelial cells( squamous et)
• dead ended
• Slightly larger than blood capillaries

Question 18

Why are lymphatic capillaries leaky/permeable?

Answer 18

Because these cells LOOSLEY overlap one another.

Question 19

What purpose do collagen filaments serve regarding lymphatic capillaries?

Answer 19

Collagen filaments are going to anchor the lymphatic capillaries and hold these cells in place.

Question 20

Where do the lymphatic capillaries empty into?

Answer 20

Into lymphatic collecting vessels

Question 21

Describe the movement of fluid into the capillaries.

Answer 21

• When pressure is higher in the interstitial space than the fluid inside the capillary -> fluid can then enter into the capillary
• Pressure is created when there is a build up of fluid in the capillaries, these actions then cause the fluid to move foward

Question 22

Where are lymphatic organs found?

Answer 22

In digestive organs, NOT in bones or nervous system

Question 23

Under what conditions do the mini valves open or close?

Answer 23

Based on the amount of fluid/pressure

Question 24

T/F: Mini valves allow large proteins to move in.N

Answer 24

true

Question 25

Under what conditions will mini valves open under?

Answer 25

When interstitial fluid pressure is high

Question 26

Under what conditions will minivalves close?

Answer 26

When the interstitial fluid pressure is low

Question 27

What is the minivalve system>?

Answer 27

System allows for the cell to open and close. (this can occurs since one part of the collagen filament is attached and the other part of the filament)

Question 28

What are lacteals?

Answer 28

The lymphatic capillaries of the small intestines

Question 29

What does dead ended mean?

Answer 29

That flow occurs in only one direction

Question 30

Describe the lymphatic collecting vessels.

Answer 30

- lymphatic capillaries merge here - Like veins thesse have thinner walls (where there is less tunica media) - they have three tunica - more valves than veins (these are important b/c there is low pressure here so have to keep from backing up)

Question 31

What is the major role of lymphatic trunks?

Answer 31

- drain larger areas

Question 32

Describe lymphatic trunks

Answer 32

- there are 5 major trunks which are named based on the areas that they drain - point where the lymphatic collecting vessels will empty into

Question 33

What is the site of absorption

Answer 33

Lacteals

Question 34

What substances go into the lymphatic capillaries of the intestines?

Answer 34

-Large fat

Question 35

Identify the process where blood cells exit the capillaries.

Answer 35

Diapedesis

Question 36

Identify the process where directioal movement of cells occurs in response to chemicals

Answer 36

chemotaxis

Question 37

What causes redness and heat of an inflamed area due to local hypermia

Answer 37

vasodilation

Question 38

During phagocyte mobilization involves what

Answer 38

Mainly macrophages and neutrophil migration into inflamed areas.

Question 39

List the events that are associated with inflammatory responses

Answer 39

- vasodilation - phagocyte mobilization - increased vascular permeability

Question 40

What do activated T cells and marcophages release?

Answer 40

Cytokines

Question 41

Whys is the release of cytokines important?

Answer 41

Helps to mobilize cells and attract other leukocytes into the area

Question 42

What are natural killer cells (NK)?

Answer 42

Cells that have the ability to kill cancer/abnormal cells before the adaptive immune system is activated

Question 43

What do antigens do in regards to the adaptive immune response?

Answer 43

Antigens are a subatance that will activate the adaptive immune response