lymphatic system

Question 1

lymphatic system

Answer 1

Made up of:
Lymphatic Vessels:
Vessel network that collects fluid within the interstitial space

Lymph:
Fluid within the vesselsknown as lymph

Lymphatic Organs:
Primary: Thymus and bone marrow
Secondary: lymph nodes, tonsils, spleen, MALT, GALT

Question 2

interstitial fluid collects within tissue

Answer 2

• Higher blood pressure at arteriole end on capillary bed causes water to leak
• Reduced water content in blood causes osmosis and water is reabsorbed into capillaries at venule end
  -Excess fluid must be reabsorbed and transport to blood circulation

Question 3

lymphatic vessels and capillaries

Answer 3

• Lymphatic vessels surround blood capillaries to absorb excess intestinal fluid and small proteins
• Lymphatic capillaries are lined by endothelial cells and their basement membrane is incomplete or absent that allows fluid (and proteins) to enter the lymphatic capillaries
  -The fluid is it is now known as LYMPH. Endothelial flaps are valves that allow unidirectional absorption

Question 4

lacteals

Answer 4

-Lacteals are lymphatic vessels within the villi of the small intestine
- They absorb larger dietary fats in the interstitial fluid that can’t enter the blood stream
- These fats are transported in the lymphatic system to the circulatory system

Question 5

lymphatic vessels

Answer 5

• From the lymphatic capillaries, larger lymphatic vessels carry and return lymph back to the circulatory system
• Pulsation from close by arteries and compression from surrounding muscles can help move lymph towards the trunk
• Valves within lymphatic vessels prevent backflow of lymph

Question 6

lymphatic trunks

Answer 6

• Lymphatic vessels come together to form trunks

Lymph from the right :
side of the head & neck
upper limb
thorax
upper abdominal wall
Drains to the right subclavian vein via the right lymphatic duct

Lymph from all other regions of the body drains into the left subclavian vein via the Thoracic Duct

Question 7

lymphoid organs

Answer 7

Primary Lymphoid Organs:
Responsible for the production of mature lymphocytes
Bone marrow & Thymus

Secondary Lymphoid Organs:
Filters where antigen-driven proliferation and differentiation occurs
Lymph nodes/ Tonsils/ Spleen

Mucosa-associated lymphoid tissue (MALT)

Named based on location:
Bronchus-associated lymphoid tissue (BALT)

Gut-associated lymphoid tissues (GALT)

Question 8

lymph nodes

Answer 8

Small structures that interrupt the lymphatic vessels

They are dense areas of lymphoid tissue (lymphocytes) that are surrounded by a dense fibrous capsule

Afferent lymphatic vessels enter the lymph node and efferent lymphatic vessels exit

They filter lymph to detect any foreign antigens and mount an immune response

Question 9

functions of lymphatic system

Answer 9

is responsible for the removal of interstitial fluid from tissues

absorbs and transports fats from the digestive system

Is involved in the immune system, producing mature lymphocytes and detecting foreign antigens