Chapter 16: Lymphatic System Flashcards

1
Q

what type of system is the lymphatic system?

A

closed ended

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2
Q

3 functions of the lymphatic system

A
  1. defends body against diseases
  2. absorbs lipids from digestive system & transports them into bloodstream
  3. transports excess fluid away from interstitial spaces & returns it back to bloodstream
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3
Q

important cells to lymphatic system

A

T cells & B cells

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4
Q

lymphatic pathway

A
  1. lymphatic capillaries
  2. lymphatic vessels (afferent)
  3. lymph nodes
  4. larger lymphatic vessels (efferent)
  5. lymphatic trunks
  6. lymphatic collecting ducts
  7. subclavian veins in thorax
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5
Q

lacteals

A

found in small intestine; specialized lymph capillaries that absorb lipids/fats & transfer them back to bloodstream

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6
Q

capillaries

A
  • microscopic, closed ended tubes
  • thin walled
  • networks parallel blood capillaries through body
  • walls formed from simple squamous tissue
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7
Q

vessels

A
  • similar to veins, but thinner
  • contain semilunar valves
  • 3 layers
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8
Q

3 layers of lymphatic vessels

A
  1. endothelial (inner)
  2. smooth muscle (middle)
  3. connective tissue (outer)
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9
Q

trunk

A
  • drain lymph from lymphatic vessels
  • named for region they serve
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10
Q

lymphatic trunks

A
  • lumbar
  • jugular
  • subclavian
  • bronchomediastinal
  • intercostal
  • interstitial
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11
Q

collecting ducts

A
  • drain lymph from trunks
  • thoracic duct (large) and right lymphatic duct (small)
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12
Q

the thoracic duct drains to

A

left subclavian vein near junction w/ left jugular vein

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13
Q

the small right lymphatic duct drains to

A

right subclavian vein

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14
Q

afferent vessel

A

leads to lymph node

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15
Q

efferent vessel

A

leads away from lymph node

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16
Q

lymph

A

interstitial fluid once its entered lymphatic vessels

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17
Q

what does capillary blood pressure do?

A

filers water & small molecules from the blood

18
Q

resulting tissue fluid (after capillary bp filters)

A
  • same composition as blood plasma
  • contains water, nutrients, gases, & hormones
  • exception: tissue fluid does not contain large plasma proteins
19
Q

lymph formation

A

formation from the plasma normally exceeds reabsorption leading to the net formation of tissue fluid; increases the tissue fluid hydrostatic pressure within interstitial spaces, forcing fluid into lymphatic capillaries & forming lymph

20
Q

edema

A

excess tissue fluid accumulation

21
Q

when is lymph flow highest?

A

physical activity & exercise

22
Q

lymph flow

A

muscle activity influences the movement of lymph through lymphatic vessels

23
Q

what factors determine lymph flow?

A
  • contraction of skeletal muscles compresses lymphatic vessels, moving the lymph
  • respiratory process creates low pressure in thorax & high pressure in abdomen during inspiration; sends lymph from abdomen to thorax
  • smooth muscle in larger lymphatic vessels contract to aid in flow of lymph
24
Q

roles of lymphatic capillaries (6)

A
  • absorption of dietary fat
  • delivery of absorbed fats to bloodstream
  • return of small proteins filtered by blood capillaries to bloodstream
  • collection of excess interstitial fluid
  • delivery of excess fluid to bloodstream
  • delivery of foreign particles to the lymph nodes
25
Q

what allows easy entry of tissue fluid?

A

flap like valves between cells of lymphatic capillaries

26
Q

mucosa associated lymphoid tissue (malt)

A

unencapsulated lymphatic tissue of the digestive, urinary, respiratory, & reproductive tracts

27
Q

tonsils & appendix

A

composed of lymphatic nodules (compact masses of lymphatic tissue)

28
Q

peyers patches

A

aggregates of lymphatic nodules found in ileum (distal part of small intestine)

29
Q

lymphatic organs

A
  • consist of encapsulated lymphatic tissue
  • lymph nodes, spleen, thymus
30
Q

how do antibodies react to antigens?

A

in 3 different ways

31
Q

3 ways antibodies react to antigens:

A
  1. direct attack on antigens
  2. activation of complement
  3. stimulation of local change, inflammation, to help prevent spread of infection
32
Q

immune responses (2)

A

primary & secondary

33
Q

primary immune response

A

produced by first encounter with antigen; 1st antibodies appear in 5-10 sys, and remain for several weeks; memory B cells also produced

34
Q

secondary immune response

A

subsequent exposure to antigen produced high concentration of antibodies in 1-2 days; antibodies remain for months or years; memory B cells live for many years

35
Q

colostrum

A

very first breast milk; antibody rich

36
Q

autograft

A

transplant from self

37
Q

isograft

A

transplant from identical twin

38
Q

allograft

A

transplant from same species

39
Q

xenograft

A

transplant from different species

40
Q

which transplants tend to cause rejection?

A

allograft & xenograft

41
Q

which transplants don’t usually cause rejection?

A

autograft & isograft

42
Q

HIV

A
  • virus that breaks down immune system
  • caused by infected needles, sexual contact, birth/milk from infected mother
  • attacks macrophages and helper T cells
  • when helper T cells decrease, B cells can’t produce antibodies
  • person dies from loss of immune response against pathogens