Chapter 24- The body's defenses. Flashcards Preview

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Flashcards in Chapter 24- The body's defenses. Deck (25)
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1

Innate Immunity

-born with it

(typically less efficient than adaptive immunity)

2

Adaptive Immunity

our bodies learn pathogen (vaccinations, Chicken Pox)

3

Lymphatic System

Vessels, tissues, and organs where pathogens meet immune cells.

4

Lymphatic Vessels:

Collect fluid from body tissues and return it as lymph to the blood

5

Lymph Organs:

spleen and lymph nodes are packed with white blood cells that fight infections

6

First line of defense

External Innate defense

(skin, mucus)

7

Second line of defence

Internal Innate defense

(Phagocytic cells)

8

Third Line of Defense:

adaptive cells

9

The internal innate defenses depend on:

white blood cells and defensive proteins

10

Neutrophils

phagocytic cells that engulf pathogens

11

Macrophages

large phagocytic cells that wander through the interstitial fluid

12

Natural Killer cells

attack killer and virus-infected cells

13

Inflammatory response

inflames an area to keep pathogen in one site and then attack there

14

Adaptive immunity depends on

B cells and T cells

15

B cells:

fully develop and become specialized in the bone marrow

16

T cells:

migrate via blood to the thymus

17

Thymus:

gland in the chest where T cells mature and become specialized

18

Antigens

molecules (usually pathogens) that elicit a response from a lymphocyte

19

Clonal Selection

produces memory cells that help fight subsequent exposures to antigens

20

B cells secrete

antibodies that bind antigens

21

The binding of antibodies to antigens

blocks or helps destroy an invader

22

Vaccines stimulate

B cells

23

HIV deletes

helper T cell response

24

Primary response to antigen

happens when you've never seen that antigen before.

25

Secondary Immune response is

longer