20 Lymphatic Flashcards
Lymph vessels:
Return tissue fluid back to blood stream
Absorption of fats from small intestine
Lymphoid tissue helps defend the body against disease
Lymph is composed of
water, electrolytes, waste from metabolizing cells, and some protein that leaks out of the capillaries of the systemic circulation
Where does lymph come from?
formed from the plasma during capillary echange (found in interstitial space)
__ L/day of lymph is filtered from the blood into the ____. It leaves here through the _____ which then carry the lymph toward the heart and eventually empty it into the ___.
20 L/day
interstitium(tissue spaces)
lymphatic vessels
blood
Lymphed edema
accumulation of lymph due to failure of lymphatic system
Blockage in lymph vessels causes
elephantiasis (swelling, thickened skin)
Lymph vessels have ___-___ valves which cause the lymph to move in one direction
one way
Lymph moves towards
the heart
Lymph flows toward the heart through a series of larger and larger ______ ______ until it reaches the large ___
Lymphatic vessels
Lymphatic ducts
The lymphatic ducts empty into the ________ ______, then into the ________
Subclavian Veins
bloodstream
Lymph movement through vessels (3)
- skeletal action pump (muscles contracting)
- respiratory pump (- pressure from inhalation)
- smooth muscle contraction within wall of vessels
Lymphoid organs filter,
Filter blood/lymph for pathogens and cancerous cells
Lymph nodes
Cluster of lymphoid tissue; filter the lymph
Vessels going towards node
afferent
Vessels leaving node
efferent
Cervical lymph nodes (cluster)
clean whats drained by head/neck
Axillary lymph nodes (cluster)
clean whats drained by arms/shoulders/breast/chest
Inguinal nodes (cluster)
clean whats drained by legs/genitalia
Tonsils are located in ____
Pharynx (throat)
Palatine tonsils
visible, in back of mouth (sometimes removed)
Pharyngeal tonsils (adenoids)
where opening of nasal cavity, upper pharynx meet
Lingual tonsils
back of tongue
Thymus gland located in ____
mediastinum in thoracic cavity
The thymus plays a crucial role in _____
the development of immune system in children, shrinks after puberty
Spleen located in
upper left quadrant of abdominal cavity
Spleen filters ___
blood (not lymph)
Spleen stores ___
blood-platelets (stops bleeding)
Spleen produces ____
lymphocytes
The spleen is easily ______
broken/ruptured (friable)
Lymphoid organs
Spleen
Thymus
Tonsils
Lymph nodes
Lymphoid tissue is scattered in
gut, lungs, skin
