Lymphatic System

Question 1

Function(s) of lymphatic system

Answer 1

• returns lost fluids to circulatory system
  -constantly on the lookout for foreign invaders (absorbs bacteria and viruses with fluid it collects) (identifies foreign materials and “sounds the alarm”

Question 2

Organization of LS

Answer 2

resembles the cardiovascular system
-lymphatic vessels (small to large)
- not a loop; only moves fluid in one direction

Question 3

Lymphatic fluid =?

Answer 3

lymph

Question 4

Lymphatic Formation and Flow

Answer 4

plasma leaks from capillaries and becomes interstitial fluid around cells, becomes lymph when absorbed into lymphatic capillary

Question 5

Lymphatic vessels (small to large)

Answer 5

lymphatic capillaries join to form lymphatic vessels, vessels join to form lymphatic trunks

Question 6

Lymph Movement

Answer 6

system has no pump
-moves lymph by contracting vessels, squeezed by muscles of body

Question 7

Lymphatic trunks

Answer 7

all named for the body region they drain
- lead 2 major lymphatic ducts

Question 8

Thoracic duct

Answer 8

collects/drains from MOST of the body

Question 9

Right lymphatic duct

Answer 9

collects/drain from right upper body only

Question 10

Where do ducts return the fluid?

Answer 10

return fluid to circulation in subclavian veins (large veins under each clavicle)

Question 11

Immune System Cells (White blood cells)

Answer 11

cells of the lymphatic system = lymphocyte (type of WBC)

Question 12

Where are WBCs made?

Answer 12

made in bone marrow

Question 13

T lymphocytes (T-cells)

Answer 13

mature in thymus (that’s why called T-cells)

Question 14

B lymphocytes (B-cells)

Answer 14

stay/mature in bone marrow

Question 15

Natural Killer cells (NK cells)

Answer 15

destroy foreign or diseased (cancer) cells

Question 16

Macrophages

Answer 16

a phagocytic cell that consumes old worn-out blood cells as well as disease - causing agents
-(easily damaged, especially when enlarged from illness)

Question 17

Lymphatic Organs

Answer 17

Lymphatic tissues, lymph nodes, spleen, and thymus

Question 18

Lymphatic Tissue

Answer 18

present in tissue open to the outside world, removes pathogens from food and air

Question 19

What lymphatic tissues are open to the outside world?

Answer 19

Digestive, respiratory, urinary, and reproductive
-ex: tonsils

Question 20

Lymph Nodes

Answer 20

located along lymph vessels, cleanse the lymph passing through
house T-cells and B-cells to fight infection

Question 21

Spleen

Answer 21

• Largest lymphatic organ
  acts like a lymph node but scans and cleans BLOOD
• can be removed and lead normal life

Question 22

Thymus

Answer 22

• found near the heart (part of endocrine system)
• nursery for T-cells, largest in childhood, stops growing after puberty
• starts shrinking therefore less production of T-cells(bad immune system with age)