lymphatic system

Question 1

what two systems do mammals have?

Answer 1

The blood circulatory system (primary system)
The lymphatic system (secondary system)

Question 2

what is the lymphatic system?

Answer 2

One way system that consists of glands and vessels that
finishes in dead end vessels.

Question 3

what are the two main parts of the lymphatic system?

Answer 3

2 main parts are the Lymph Vessels and Lymph Nodes

Question 4

how does lymph move around the body?

Answer 4

Valves, preventing backflow.
muscular walls of vessels
Body movements pressing on the vessels.

Question 5

how is lymph transported?

Answer 5

Lymph is transported in lymph vessels in the same way that blood is transported in veins.

Question 6

how is lymph returned to the blood?

Answer 6

Valves ensure lymph only moves in one direction towards the
thoracic duct on the left side of the body and the right
lymphatic duct at the right shoulder.

These ducts then empty into the bloodstream at the
subclavian vein.

Question 7

what duct empties lymph into the subclavian vein on the left side of the body?

Answer 7

thoracic

Question 8

what duct empties lymph into the subclavian vein on the right side of the body?

Answer 8

right lymphatic duct

Question 9

what are lymph nodes/

Answer 9

Swellings containing on lymph vessels that contain a large numbers of white blood cells.

Question 10

what is the function of lymph nodes?

Answer 10

Found in clusters called glands (tonsils).

They fight infection by:
-Filtering bacteria from the lymph.
-Maturing and storing white blood cells

Question 11

what role does the spleen have in the lymphatic system/

Answer 11

Spleen: Filters bacteria, recycles red blood cells and stores lymphocytes.

Question 12

what are the functions of lymph?

Answer 12

Defence:

Filtering microorganisms (bacteria)
Maturing and storing WBC’s
Destroying microorganisms
Help hearing and balance
Swollen glands are actively fighting infection.

Question 13

How is lymph formed?

Answer 13

When blood is pumped by the heart under high pressure, some plasma leaks out of the capillaries and into the space around the cells.

This is called extra – cellular fluid/tissue fluid as it is outside the cells, it is similar to plasma but does not contain blood cells.

90% of this fluid is removed from space around cells and returned to the blood by osmosis through the capillaries.

10% enters the lymph vessels and is then called Lymph. Lymph moves through the vessels by muscular action of the vessel walls.

Question 14

Does plasma contain any blood cells?

Answer 14

no- meaning lymph has no blood cells