1.7 Formation of tissue fluid and lymph Flashcards
When water in the plasma is forced out of the cells, what is the pressure of the hearts contraction called?
Hydrostatic pressure, takes dissolved nutrients and oxygen from the oxyhaemoglobin in the red cells.
What cannot pass through the basement membrane?
Blood cells and blood proteins such as albumin, remains behind.
Where does the tissue fluid return?
Circulatory system, otherwise bodies would swell with the accumulating tissue fluid. Condition known as oedema which, if not treated, can kill.
When tissue fluid is returned to the capillaries what is the process called?
Osmosis- movement of water through a semi-permeable membrane from a low concentration to a high concentration.
What happens to the tissues during hydrostatic pressure?
Water surrounds the tissues, creating an imbalance resulting in water being drawn back into the capillaries by osmosis due in particular to the presence of albumin in the capillaries.
Referred to as osmotic pressure.
What happens when water returns to the capillaries?
Takes the dissolved carbon dioxide and other waste products with it.
What transport system does lymph drain into?
Lymphatic system- drains into lymph capillaries, which lead to lymph vessels, which have a similar structure to veins.
Transport system is one way, leading through lymph capillaries in the tissues through the lymph vessels to join the circulatory system at the top of the chest.
Lymph drains into main veins leading from arms to superior vena cava. Maintains correct blood volume.
What are the swellings called in the lymphatic system?
Lymph nodes- particularly in neck, under our arms and in our groin. These nodes store and develop lymphocytes that screen the returning lymph for pathogens, destroying any that are found.
When fighting infection these nodes swell so we often refer to our ‘glands’ swelling.
