Lymphatic Vessels and Lymph Circulation

Question 1

slightly larger in diameter than blood capillaries

Answer 1

lymphatic capillaries

Question 2

slightly larger in diameter than blood capillaries, the endothelial cells overlap and form one-way flaplike mini-valves that allow fluid into capillaries but not out

Answer 2

lymphatic capillaries

Question 3

in what direction do lymphatic capillaries allow fluid?

Answer 3

into the capillaries but not out

Question 4

collagen fibers that attach the lymphatic capillaries to surrounding tissues. When there is excess interstitial fluid, the filaments are pulled taut and open up the spaces between lymphatic capillary endothelial cells (valves) even more.

Answer 4

anchoring filaments

Question 5

what are anchoring filaments made of?

Answer 5

collagen fibers

Question 6

what attaches lymphatic capillaries to surrounding tissues

Answer 6

anchoring filaments

Question 7

What happens to the anchoring filaments when there is interstitial fluid?

Answer 7

the filaments are pulled taut and open up the spaces between lymphatic capillary endothelial cells (valves) even more

Question 8

Special lymphatic capillaries found in the small intestine that pick up lipids and lipid soluble vitamins. The lymph has a milky appearance due to the presence of lipids and is referred to as chyle.

Answer 8

lacteals

Question 9

Where are lacteals found?

Answer 9

small intestine

Question 10

What do lacteals pick up?

Answer 10

lipids and lipid soluble vitamines

Question 11

What is the appearance and why and what is it called in the lymph of lacteals?

Answer 11

the lymph has milky appearance due to the presence of lipids and is referred to as chyle

Question 12

similar to veins except they are even thinner walled and have more valves, they merge to form larger vessels (lymphatic trunks)

Answer 12

collecting lymphatic vessels

Question 13

What do collecting lymphatic vessels merge to form?

Answer 13

larger vessels (lymphatic trunks)

Question 14

What are the 5 main lymphatic trunks?

Answer 14

lumbar 
intestinal 
bronchomediastinal 
subclavian 
jugular

Question 15

What lymphatic trunk drains the thorax?

Answer 15

bronchomediastinal

Question 16

From the lymphatic trunk where does the lymph flow?

Answer 16

into one of two ducts (thoracic or right lymphatic duct)

Question 17

This starts at the cisterns chyli, drains both the left and right sides of the body inferior to the ribs and the left head, neck, thorax, and the arm. Lymph from here drains into the left subclavian vein.

Answer 17

thoracic (aka left lymphatic) duct

Question 18

Where does the thoracic (left lymphatic) duct start?

Answer 18

cisterna chyli

Question 19

What 6 areas does the thoracic (left lymphatic) duct drain?

Answer 19

left and right sides of body inferior to the ribs 
left head
neck
thorax
arm

Question 20

Into what vein does the lymph from the thoracic (aka left lymphatic) duct drain?

Answer 20

left subclavian vein

Question 21

This is a pouch at the beginning of the thoracic duct that drains the left and right lumbar trunks, and the intestinal trunk.

Answer 21

cisterna chyli

Question 22

What 3 areas does the cisterna chyli drain?

Answer 22

left and right lumbar trunks

intestinal trunk

Question 23

This drains the right thorax, right arm, right side of neck, right side of head, and part of the liver. Lymph returns to the cardiovascular system via the right subclavian vein.

Answer 23

right lymphatic duct

Question 24

What 5 areas does the right lymphatic duct drain?

Answer 24

right thorax 
right arm
right side of neck
right side of head
part of liver

Question 25

Where does the lymph of the right lymphatic duct return too?

Answer 25

the cardiovascular system via the right subclavian vein