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Anatomy and Physiology 2 > Chapter 20- The lymphatic system > Flashcards

Chapter 20- The lymphatic system Flashcards

1
Q

Lymphatic system general function

A

Picks up fluid lost by blood capillaries

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2
Q

The lymphatic system consists of (4)

A

lymph vessels, lymph, lymphoid organs, and lymph nodes

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3
Q

Lymphoid organs function (3)

A
  1. Provide structural basis for immune system
  2. Monitors body for infection
  3. Houses phagocytic cells and lymphocytes
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4
Q

Lymphatic vessels function

A

Picks up protein-containing interstitial fluid that is not reabsorbed by blood capillaries. They only move fluid toward the heart.

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5
Q

Lymph

A

Interstitial fluid not reabsorbed by the capillaries (called lymph once it enters the lymph vessel).

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6
Q

Lymph capillaries function

A

Blind ended vessels that weave through capillary beds, they allow intake of large proteins.

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7
Q

Which structures make the lymph capillaries more permeable? (2)

A
  1. Loosely aggregated endothelial cells in walls of capillaries- form flaps that open.
  2. Anchoring filaments- increase in interstitial fluid pulls on anchoring filaments
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8
Q

Anchoring filaments function

A

Increase in interstitial fluid pulls on anchoring filaments. Flaps of endothelial wall open easily. As you drain more fluid into the lymphatic capillary, the pressure goes down and the trap door closes.

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9
Q

When do capillaries become even more permeable?

A

During illness/infection capillaries become even more permeable. Pathogens transported to lymph nodes, where the immune system destroys them

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10
Q

Lacteals

A

Specialized lymph capillaries for movement of fats from small intestine to bloodstream. Fats are very large, so specialized lymph vessels are necessary. Lacteals are very permeable

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11
Q

Lymph capillaries drain into

A

Collecting lymphatic vessels. These vessels drain into lymphatic trunks, which drain into lymphatic ducts.

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12
Q

Collecting lymphatic vessels

A

Where lymph capillaries drain into first. They have large lumen to create low pressure, so lymph flows through easily. In skin- vessels travel with superficial veins, in the trunk- vessels travel with deep arteries

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13
Q

Lymphatic trunks (5)

A
  1. Lumbar trunk (2)- drains lower extremities (legs)
  2. Bronchomediastinal trunk (2)- drains thorax
  3. Subclavian trunk (2)- drains upper extremities (arms) and superficial thoracic wall
  4. Jugular trunks (2)- drains head and neck
  5. Intestinal trunk (1)- drains digestive organs
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14
Q

Lymphatic ducts definition

A

Structures that lymphatic trunks drain into. Both ducts empty into junction at internal jugular vein and subclavian vein

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15
Q

Lymphatic ducts (2)

A
  1. Right lymphatic duct

2. Thoracic duct

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16
Q

Right lymphatic duct

A

Drains lymph from right upper limb, right side of head, and right thorax

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17
Q

Thoracic duct

A

Drains any part of the body that is not drained by the right lymphatic duct- left upper limb, left side of brain, left side of thorax, entire abdomen and pelvis, both lumbar trunks (right and left limbs), intestinal trunk. Usually begins at the cisterna chyli. Gets lymph from 2 lumbar trunks and intestinal trunk

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18
Q

Adaptations that allow lymph vessels to push lymph through vessels and back into circulation (4)

A
  1. Smooth muscle in larger vessel walls helps push lymph through
  2. Similar to circulation in veins- valves prevent backflow, respiratory pump
  3. Circulation also improved by pulsatile nature of nearby arteries
  4. Physical movement (skeletal muscle) is important for increasing lymph flow
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19
Q

How does physical movement increase lymph flow?

A

For infected regions- body part should be mobilized to increase rate of removal of inflammatory material- lymph is circulated through the body part faster. If you can’t move the limb, eventually the vessels will be blocked off and not be able to carry any more

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20
Q

What happens if lymph vessels are blocked off?

A

Blocking or removing lymph vessels/nodes causes severe, localized edema- nowhere for interstitial fluid to drain

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21
Q

Immune system cells and supporting cells that form lymphoid tissue (4)

A
  1. Lymphocytes
  2. Macrophages
  3. Dendritic cells
  4. Reticular cells
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22
Q

Lymphocytes

A

Immune cell- B cells and T cells. Lymphocytes regularly circulate through blood vessels, lymphoid tissue, and loose connective tissues of the body- ensures good patrol of the body for foreign bodies

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23
Q

B cells function

A

Produce plasma cells, which secrete antibodies into the blood, don’t play direct role in body defense. Antibodies put a “red flag” on foreign antigen cells- marked for destruction

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24
Q

Types of T cells (2)

A
  1. Helper T cell

2. Killer T cell

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25
Q

Helper T cell (3)

A

Manages/mediates immune response- helper T cell function is necessary for killer T cell function.

  1. Assists in maturation of B cells, macrophages, and other immunity related cells
  2. Stimulate an immune response to occur at an appropriate rate
  3. Also prevent an excessive immune response- don’t want to damage the body’s own cells
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26
Q

Killer T cell

A

Cell destroyer, kills off virus infected and cancerous cells

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27
Q

Macrophages

A

Immune cell. Phagocytize large, foreign substances and help activate T cells

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28
Q

Dendritic cells

A

Immune cells- cells that escort “red flagged” cells back to lymph nodes. Dendritic cells put flagged cells on display- other immune cells know to destroy

29
Q

Reticular cells

A

Supporting cell. Produce stroma- supports cell types in lymphoid tissue/organs.

30
Q

Functions of lymphoid tissues (2)

A
  1. Houses lymphocyte cells, allows them to proliferate

2. Provides surveillance point for lymphoid cells

31
Q

What are lymphoid tissues made of?

A

Mostly made of reticular connective tissue. Exception- not in thymus

32
Q

Types of lymphoid tissue (2)

A
  1. Diffuse lymphoid tissue

2. Lymphoid nodules

33
Q

Diffuse lymphoid tissue

A

This tissue is present in most organs of the body. It is a loose aggregation of lymphoid cells and reticular fibers, which gives more room for white blood cells to move around. Larger collections of diffuse lymphoid tissue are found in mucous membranes (any opening in the body leading to the outside has a mucous membrane- inner lining of the mouth and nose).

34
Q

Lymphoid nodules

A

Tightly packed lymphoid cells and reticular fibers. Usually form parts of larger lymphoid organs (especially lymph nodes)- lymph nodes are collections of lymphoid nodules pushed together. Contains germinal centers.

35
Q

Germinal centers

A

Found in lymphoid nodules. Areas of proliferating B cells- the cells are maturing and are exposed to foreign substance

36
Q

Primary lymphoid organs

A

Location where B and T cells mature- B cells mature in the red bone marrow, T cells mature in the thymus

37
Q

Secondary lymphoid organs

A

Lymph nodes, spleen, mucosa-associated lymphoid tissue (malt). Location where mature lymphocytes first encounter antigens and become activated

38
Q

Lymph nodes locations

A

Form clusters in axillary, cervical, and inguinal regions. Areas where large number of collecting lymph vessels converge and form lymphatic trunks

39
Q

Importance of lymph nodes (2)

A
  1. Activating immune system- dendritic cells bring antigens to lymph nodes to “display” them to lymphocytes- activate T cells
  2. Cleanses lymph via filtration
40
Q

How do lymph nodes cleanse lymph?

A

Lymph passes through nodes before it enters back into circulation- macrophages clean lymph of microorganisms and other particles. Clean lymph can go back to circulation without risking spreading infection to other areas of the body

41
Q

What is the importance of clusters of lymph nodes?

A

Clusters means that lymph has to pass through multiple nodes to go to circulation- it will be cleaned more efficiently

42
Q

Compartments of lymph nodes (2)

A
  1. Cortex

2. Medulla

43
Q

Lymph node cortex

A

Outer portion of the lymph node. The outer portion of the cortex has dense follicles- follicles contain dividing B cells. The inner portion contains constantly moving T cells.

44
Q

Medulla of the lymph node

A

Inner portion of node- both B and T cells found here

45
Q

Lymph sinus

A

Sites where macrophages reside

46
Q

Afferent lymph vessels

A

There are several of these (more afferent than efferent). They bring lymph into the node, and lymph circulates through the sinuses.

47
Q

Efferent lymph vessels

A

There are 2 of these vessels. Allows lymph to leave the node. Lymph enters a node faster than it can leave, so it remains in the node slightly longer and is drained more slowly than it enters. Benefit- ensures lymph is cleaned out before it exits.

48
Q

Lymphadenopathy

A

Swollen lymph nodes. Nodes overwhelmed and blocked off due to high infection rate. They become inflamed, swollen, tender, and filled with pus. Usually necessitates use of antibiotic to assist in treatment of infection

49
Q

Why do secondary cancer sites cause swollen lymph nodes?

A

Metastasizing cancer cells break free from the original tumor, get “stuck” in lymph nodes in different parts of the body and form other tumors. Lymph nodes become swollen/enlarged, but are not painful, just feel like a hard lump underneath the skin. More common in the clusters- cervical, axillary, inguinal. Ex- swelling of axillary nodes indicates breast cancer

50
Q

Which is the largest lymphoid organ?

A

The spleen

51
Q

Functions of the spleen (3)

A
  1. Important for cleansing blood (doesn’t do anything with lymph)
  2. Recycles parts of old RBCs for later reuse. Stores iron, ships other recyclables to liver for processing
  3. Stores platelets and monocytes
52
Q

How does the spleen cleanse blood?

A

The spleen is very well vascularized- pulls old and damaged blood cells (RBCs, platelets) from blood supply. Macrophages in spleen monitor the blood and pull microorganisms straight out of blood

53
Q

2 components of the spleen

A
  1. Red pulp- “recycling center”. Area of erythrocyte and pathogen destruction, packed with red blood cells and macrophages
  2. White pulp- serves immune function, contains mostly lymphocytes on reticular fibers
54
Q

Can you bleed to death if the spleen ruptures?

A

Yes, if the injury if severe. Bone marrow and liver will take over the functions of the spleen if it’s removed- they can clean blood as well since this is an important function. About 20% of people have a “secondary” spleen- they have a second spleen that will develop when the first is removed. Won’t be as good as the original spleen, but it will still work

55
Q

Mucosa associated lymphoid tissues (MALT) definition

A

Lymphoid tissues found specifically in mucous membranes. Most mucous membranes lead into/out of the body- easy “in” for pathogens- MALT prevents pathogen entrance at these areas

56
Q

MALT locations (3)

A
  1. Tonsils
  2. Peyer’s patches
  3. Appendix
57
Q

Tonsils function

A

Found at entrance to pharynx in throat- fight infections/bacteria coming in from the mouth

58
Q

Types of tonsils (4)

A
  1. Palatine tonsils- largest, most likely to become infected
  2. Lingual tonsils- lymphoid follicles at base of tongue
  3. Adenoids (pharyngeal tonsils)- in posterior wall of nasopharynx
  4. Tubal tonsils- surround openings of auditory tubes into pharynx
59
Q

Peyer’s patches

A

Aggregated lymphoid nodules that are structurally similar to tonsils. Prevent bacteria from entering, found in the wall of the ileum of the small intestine. Good for the generation of “memory” lymphocytes.

60
Q

Appendix

A

High concentration of lymphoid follicles. Similar to Peyer’s patches- prevents bacteria from going from the large to the small intestine. You can live without the appendix. Good for the generation of “memory” lymphocytes.

61
Q

Thymus location

A

Located in the chest in front of the aorta

62
Q

Thymus

A

Site of T cell maturation. Without the thymus, mature T cells capable of body defense wouldn’t exist

63
Q

When is the thymus the largest and the most active?

A

Young children need to develop an appropriate set of T cells to defend against new pathogens, but the thymus begins to atrophy in early adolescence (8-11). Will still put out immune cells, but at a reduced rate- immune system remembers these infections, don’t need a huge amount of T cells. In old age, thymus is mostly fibrous and fatty tissue

64
Q

Cortex of the thymus

A

packed tightly with lymphocytes

65
Q

Medulla of the thymus

A

Medulla has fewer lymphocytes. It contains Hassell’s (thymic) corpuscles- site of regulatory T cell production. Function- regulatory T cells prevent autoimmune responses

66
Q

Thymosin

A

Hormone in thymus, regulates function. Function- stimulates development/maturation of T cells- stimulates immunocompetency. Immunocompetency teaches the T cell what it should be looking for

67
Q

How is the thymus different from other lymphoid organs?

A
  1. No B cells found in thymus
  2. No direct immune response
  3. No reticular fibers. Has epithelial cells instead- ideal for T cell maturation.
68
Q

Why doesn’t the thymus participate directly in immune response?

A

The thymus is only a site for T cell maturation, not launching an immune response. The blood thymus barrier prevents immature T cells from being exposed to antigens too early. If the thymus had access to the blood supply, immature T cells would encounter pathogens or cancerous cells.

Anatomy and Physiology 2 (20 decks)

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