lymph Flashcards
- The net pressure pushing fluid ____of capillaries at the ____end is 10 mm Hg
- The net pressure pushing fluid back ____ to the capillaries at the ______ end is only 8 mm Hg
- Therefore, more fluid leaves than is __________ (about 3 L a day)
- The extra fluid is picket up by the ___________system to prevent ______
- The net pressure pushing fluid out of capillaries at the arterial end is 10 mm Hg
- The net pressure pushing fluid back in to the capillaries at the venous end is only 8 mm Hg
- Therefore, more fluid leaves than is reabsorbed (about 3 L a day)
- The extra fluid is picket up by the lymphatic system to prevent edema
Lymph capillaries are contained within
the loose connective tissue between the tissue cells and blood capillaries.
Lymph capillaries absorb the leaked fluid through
one-way “minivalves”
- Lymphatics form a one-way system with lymph flowing toward the _______
- Lymph returned to the venous system through the ______
- Lymphatics form a one-way system with lymph flowing toward the heart
- Lymph returned to the venous system through the great veins in the neck
Help protect the body by removing foreign material such as microbes from the lymphatic system.
Lymph Nodes
lymphocytes in the lymph nodes function in the
immune response.
.
Macrophages in the Lymph nodes, Do what?______________before return to the blood
Macrophages engulf and destroy microbes before return to the blood
2 Ducts Lymph is delivered
Right lymphatic duct
Thoracic duct
Drainsright upper arm and right side of head and thorax
Right lymphatic duct
Arises from cisterna chyli and drains rest of the body
Thoracic duct
Lymphatic Ducts -Each empties lymph into venous circulation at junction of _______&_______on its own side of the body
** internal jugular and subclavian veins **
Embedded in connective tissue, in clusters along lymphatic vessels
Lymphatic Nodes
Part of the the Lymph node Cortex
that enlarges when B lymphocytes proliferate
germinal centers
Parts of the Lymph node Cortex
Lymphoid Follicle
Germinal Center
Subscapular sinus
Remainder of Lymph node cortex contains
T lymphocytes
What are contained within the Lymph node medulla
Macrophages
Largest lymphoid organ
SPLEEN
Provides site for lymphocyte proliferation and immune surveillance of blood in the Spleen
White pulp
Provides site where
Aged and defective RBC destruction and recycling
in the SPLEEN
Red pulp
Spleen also stores ______and _________ for release into blood if needed
** platelets**
and
**monocytes **
A bilobed organ that secretes hormones that cause T lymphocytes to become immunocompetent
THYMUS
Thymus is most active during?
Childhood
Thymus stops growing
during adolescence
Thymus is found in INFANTS where?
inferior neck and extends into the mediastinum where it partially overlies the heart
Thymic lobes contain
an outer cortex and inner medulla
THYMUS Cortex contains densely packed _______ and scattered _________
** lymphocytes**
and
scattered macrophages
MALT stands for
Mucosa-Associated Lymphatic Tissue
protects the digestive and respiratory systems from foreign matter
MALT
- ring of lymphoid tissue around pharynx
Tonsils -
– isolated clusters of lymphoid tissue, similar to tonsils
Found in the wall of the distal portion of the small intestine
Similar structures are found in the appendix
Peyer’s patches
in the walls of the bronchi (respiratory tract
Lymphoid nodules
