Wk3 Lymphatic System Flashcards
Fluid leaves the ________ of cvs by diffusion and ________ , most of which are returned to venue and back to CVS.
A small lil baby amount of ______ fluid and escaped proteins remained that drains into lymphatic capillaries, forming a ______ which finally back to the vascular system
Fluid leaves the CAPILLARIES of cvs by diffusion and FILTRATION, most of which are returned to venue and back to CVS.
A small lil baby amount of INTERSTITIAL fluid and escaped proteins remained that drains into lymphatic capillaries, forming a LYMPH which finally goes back to the vascular system
What are the major components of the lymphatic system
It consists of a fluid (lymph)
Vessels that transport the lymph
And organs that contain lymphoid tissue
What are lympAtic vessels?
Also known as lymph vessels, are thin walled, valved structures that carry lymph.
Similar to a lymph vessel, what is a lymph capillary and what it do
Are tiny baby thin walled vessels located in the spaces between cells (not in the central nervous system tho and not in non vascular tissues).
Which serve to drain and process extra cellular fluid
Lymph capillaries merge to form WHAT
Lymphatic vessels
Lymphatic vessels carry lymph into and out of what ??? And where do they go back too
Lymph nodes and finally back to the vascular system.
Lymph _______ branch and interconnect freely and extend into almost all tissues of the body
Capillaries
Lymph capillaries join to form larger??
Vessels! They have thinner walls, more valves and relatively larger lumens than veins.
What are the three functions of the lymphatic systems?
Fluid balance
Fat absorption
Defence
Fluid balance is one of the functions of the lymphatic system, explain further
So, excess interstitial fluid (or tissue fluid) enters the lymphatic capillaries and becomes lymph which eventually returns to CVS
The lymphatic system helps absorb fat and other substances from the _____ ______
Digestive tract
What are the specialised lymphatic capillaries in villi of the small intestine that transport lipids called
They are called lacteals and the fluid is called chyle
How does the lymphatic system defend of body
By microogranisms and other foreign substances that are filtered from lymph to lymph nodes and from blood by spleen.
What are the primary organs of the lymphatic system
Bone marrow and thymus gland.
What are some secondary organs that are a component of the lymphatic system
Lymph nodes Lymphatic vessels Lymph Tonsils Spleen MALT
What is MALT
MucoSa associated lymphoid tissue
Explain lymphatic drainage in a step by step process
Lymphatic capillary Lymphatic vessel Lymph node Lymphatic vessel Lymphatic trunk Collecting duct Subclavian vein
Lymphatic vessels from all over the body drain into the thoracic duct and from there into the subclavian vein except the upper left quadrant.
Is this true?
Nope, false. They do all drain from the body expect the upper RIGHT quandrant.
The right lymphatic duct receives lymph from the upper right quadrant of the body and drains into the _____ subclavian vein
Right
the stroma (connectivness) of lymphatic tissues is a network of ______ fibres including ct cells , fribro blasts and mcacrophages.
Reticular
Name some major groups of lymph nodes and where are they located
Mastoid and sub occipital nodes Cervical lymph nodes of the neck Axillary lymph nodes under the arms Inguinal lymph nodes of the groin area Popliteal nodes behind the knee
Where is the spleen located
Left hypochondriac region of the abdominal cavity
What is the structure of the spleen
White pulp- lil islands, mostly B cells
Red pulp- venous sinuses
Large number of rbcs, macrophages
Lymphocytes and other blood cells
What are the functions of the spleen
To filter haemoglobin (not lymph) Removes aged/defective rbcs Detects and responds to foreign substances (immune response) Limited reservoir for blood Lymphocyte proliferation
Where is the thymus gland located
Located in the mediastinum above the heart
What do our tonsils do
Provide protection against bacteria and other harmful agents
What are three types of lymphocytes and what they do
T cells: defend against foreign cells and tissues; coordinate immune response
B cells : produce antibodies in response antigen that attack foreign antigens
NK cells: can attack foreign cells/antigen without previous sensitisation
What cells form memory cells
T helper and t cytotoxic cells
T cytotoxic cells directly kill antigen bearing cells
True or false
True
T helper cells secrete lymphokines/cytokines
True or false
True
Why are lymphocytes important
As different types of lymphocytes in the immune system work together to keep the body safe from foreign invaders such as bacteria, viruses as well as altered cells. (Potential cancer cells)
