32 Lab (4)

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What tissues lack lymphatic capillaries?

Avascular tissues

CNS

Parts of spleen

Red bone marrow

Characteristics of lymphatic capillaries?

Greater permeability and wider than blood capillaries

Absorb large molecules (proteina and lipids)

One way of drainage

What are the components of the lymphatic capillaries?

Lymphatic capillaries → Vessels → Trunks → Ducts

Where are lymph nodes located?

Along the lymphatic vessels

List the 5 lymphatic trunks

Lumbar trunks (lower limbs, kidneys)

Intestinal trunks (stomach, intestines)

Bronchomediastinal trunks (heart, lungs)

Subclavian trunks (upper limbs)

Jugular trunks (head, neck)

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What is the function of lymphatic ducts?

Drains lymph to veins

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What are the 2 primary lymphatic/lymphoid organs?

Red bone marrow

Thymus

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Does thymus decrease in size with age?

Yes

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What are the 3 secondary lymphatic organs?

Lymph nodes

Spleen

Lymphatic nodules

What is this?

Lymph node

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What is the physiological advantage of having more afferent lymphatic vessels than efferent?

Slow flow of lymph, which allows for thorough filtering

What is this and label?

Spleen: largest single mass of lymphatic tissue

What kind of tissue is the lymph nodules?

Mucosa-associated lymphatic tissue

Where are the 4 locations of lymph nodules?

Mucous membranes lining the GI tract

Urinary tract

Reproductive tract

Respiratory airways

What are large aggregations of lymphatic nodules?

Tonsils

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What are functions of lymph nodules?

Body’s immune surveillance and response

Trap and process antigens

Antibodies are produced

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