Lymphatic System -
Fluid in Lymph nodes and Lymphatic vessels

  1. Returns fluid to heart
  2. Helps large Molecules like Hormones and Lipids enter the blood
  3. Immune Surveillance

Proteins and Fluid seeping out from Capillaries

Interstitial Space

Lymphatic Capillaries

Lymph moves through Vessels, Trunks, Ducts

When pressure in Interstitial space higher, the lymph moves into capillaries. When lower, the capillaries are closed

No pump - Reacts to Arterial Pump and Muscles around
Has valves - to avoid back flow.

5 Trunks named after part of the body they drain from -> Right (from Right arm, head and chest) and Thorasic (from rest of the body) Lymphatic Ducts -> dumps Lymph into Vein

Immune Function

Deliver large molecules like Hormones that are too big to move through capillaries to blood stream

Lymphoid organs

Remove Foreign material from Lymph
to keep them away from blood

Diffused Lymphatic Tissue
Intestinal and respiratory tract

Lymph Nodes

Unfiltered Lymph from vessels
drains into Lymph Nodes

dendritic cells detect antigens

pass it to B cells (makes antibodies)

T cells

Spleen

White Pulp - Filters blood

Red Pulp- Old Blood cells are destroyed

Keeps RBCs and Platelets available for emergency

Thymus

Involved in development of T cells

Tonsils - Lymphoid tissue around the throat

Traps pathogens from air we inhale and food we eat