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Which Quadrant of the abdominal cavity is the spleen in?
left upper quadrant
Describe the spleen.
- internally has red and white pulp
What are the functions of the spleen?
- filters blood
- is a blood resivoir
- filters damaged and dead RBC
- removes pathogens
Where is the thymus?
in the mediastinum at the base of the heart
How do T cells mature?
immature T cells leave bone marrow and go to thymus
What is the function of T cells?
prevents autoimmune disease
Does the thymus get bigger or smaller as you age?
What are the lymphoid organs?
How are lymphoid organs separated from surrounding tissues?
by a capsule
What is lymphoid tissue?
any tissue with a ton of lymphocytes
Describe Diffuse lymphoid tissue.
loosely packed lymphocytes within connective tissue
Describe lymphoid nodules.
densely packed lymphocytes within loose connective tissue
What are examples of lymphoid nodules?
When does ISF become lymph?
when it enters the lymphatic tissue
What is the function of lymph nodes?
to filter out particulates in infection
How many nodes are in the body?
Where do Afferent vessels go?
toward the lymph node
Where do Efferent vessels go?
leaves the lymph node
Describe lymph nodes.
- surrounded by FCT capsule
- compartments with recticular fibers with WBC
- the compartments are separated by trabeculae (FCT)
Where do lymphatic vessels carry lymph?
from peripheral tissues to the venous system
What are lymphatic capillaries?
form a complex network within peripheral tissues
Describe the valves in lymphatic vessels.
- simple squamous
- prevent backflow of lymph
What do superficial lymphatic vessels travel with?
Where are the superficial veins and lymphatic vessels?
- subcutaneous layer of skin
- LCT of mucous membranes and serous membranes
What are deep lymphatic vessels?
large lymphatic vessels that travel with deep arteries and veins
Where do deep lymphatic vessels collect lymph from?
- skeletal muscles
- organs of neck, limbs, ad trunk
- thoracic and abdominopelvic cavities
What are the functions of the Lymphoid system?
- maintain normal blood and ISF volume
- eliminate variations in chemical composition of ISF
- absorb and transport lipids from digestive system
- give a different route for transport for hormones, nutrients, and waste
What is lymph?
ISF with a lower concentration of proteins than plasma
What is the main function of lymphocytes?
Where do lymphatic vessels originate?
in peripheral tissues and deliver lymph to the venous system