Lymphatic System

Maintains fluid levels in the body by draining lymph (which contains tissue fluid and fats) back into the blood.

A network of capillaries and the surrounding tissue, this is where tissue fluid is formed

A watery substance which is forced out of the capillaries and provides substance exchange for cells Such as providing gases and nutrients and removing waste products

Water Dissolved minerals and salt Glucose Small proteins & amino acids Fatty acids Ions Oxygen

Blood flowing from arterioless into capillaries has a high blood pressure and therefore high hydrostatic pressure This causes blood fluid to be forced out of the gaps in capillaries The fluid moves out & bathes surrounding tissue (now called tissue fluid)

Red blood cells Platelets Large proteins Because they’re too large to leave the gaps in capillaries

Urea Carbon Dioxide

Has a low water potential because large molecules are still in the capillaries Has a low hydrostatic pressure as there is less fluid

Low water potential and hydrostatic pressure in venule end This causes water and dissolved substances to move back into the capillaries by osmosis Until an equilibrium is reached

Once an equilibrium is met, there will still be tissue fluid present This is drained into lymph vessels and eventually drained back into the blood (around the heart)

The name given to excess tissue fluid when it enters the lymphatic system

System of lymph vessels which surround blood vessels To join back up with blood vessels near the heart and passively drain lymph into the bloodstream

Vessels which are similar to veins They surround blood vessels & contain valves to prevent the back flow of lymph

Relies on movement and muscle contraction to pump lymph to near the heart/neck area where it can be drained back into the blood

Lymph build up around the ankles and causes swelling. This is because it can no longer be pumped and will therefore be pulled down around the ankles by gravity.

Sac like structures found along the larger lymph vessels

To filter substances that pass through the lymph vessels & contain white blood cells (lymphocytes) to fight infection and disease

The largest organ in the lymphatic system. Removes any old/ damaged RBC. It contains an emergency supply of blood, which may be released when there is a large amount of blood loss.