Ch 21: Lymphatic System Flashcards Preview

A&P II: BIO426 > Ch 21: Lymphatic System > Flashcards

Flashcards in Ch 21: Lymphatic System Deck (57)
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31

What is a natural killer cell?

A large lymphocyte that destroys bacteria, microbes and foreign cells (ex. as from organ transplants causing rejection)

32

The "T" in T-lymphocyte stands for...

thymus

33

T-cells mature in...

the thymus

34

B-cells mature in...

bone

35

What type of cell is a Macrophage is ________, which means it engulfs and breaks down foreign objects.

phagocytotic

36

A dendritic cell is found in the _______ and _______ membranes and gets rid of _______.

epidermis

mucus

microbes 

37

Reticular cells are found in...

connective tissue

38

What are the two types of lymphatic tissue?

  1. Diffuse lymphatic tissue
  2. Lymphatic nodules

39

Does diffuse lymphatic tissue have a high or low concentration of lymphocytes?

low

40

Where is Diffuse lymphatic tissue found?

Give examples

Where there is access to the external.

Tonsils, respiratory tract, digestive tract

41

The most common type of diffuse lymphatic tissue is known as _____, which stands for...

MALT

Mucus Associated Lymphatic Tissue

42

Do lymphatic nodules have a high or low concentration of lymphocytes?

High

43

Lymphatic nodules form when...

needed

44

In the small intestine, lymphatic nodules are also known as 

Peyer Patches

45

Peyer Patches are looking for...

microbes in your food supply

46

Where are some places lymphatic nodules are found?

appendix, small intestine, urinary tract

47

What are the two types of lymphatic organs?

  1. Primary
  2. Secondary

48

What is the definition of a primary lymphatic organ?

They are the sites of maturation of Lyphocytes

49

In what two places do lympocytes mature?

  1. Red bone marrow
  2. Thymus

50

Red bone marrow has _______ cells that can become whtie or red blood cells.

Homopoietic stem cells

51

The thymus secretes a chemical called _______ that promotes the development and activity of T-cells

thymosine

52

What is the definition of secondary lymphatic organs?

Organs that mature lymphocytes migrate to where they can find their specific antigen.

53

Give 3 examples of secondary lymphatic organs

  1. lymph nodes
  2. tonsils
  3. spleen

54

The spleen is the largest _______ and filters _______.

secondary lymphatic organ

blood

55

The spleen has __ regions called...

2

white pulp and red pulp

56

In the white pulp of the spleen, lymphocytes are...

waiting to find their antigens

57

What occurs within the red pulp of the spleen?

  • houses extra RBCs to be used when/if more are needed
  • removes/destroys sick/dying RBCs