lymphatic system
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Construct Interactive Notes (last one of the year!)
• 5 pages of binder paper• On cover, write:
Chapter 14: Lymphatic and Immune Systems
Name, period, seat #• Number the pages
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Lymphatic System (pg 2)
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Lymphatic System (pg 2)
• Consists of lymphatic vessels and lymphoid organs
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Lymphatic System (pg 2)
• Consists of lymphatic vessels and lymphoid organs
• Functions: returns excess interstitial fluid to the blood, absorbs fat and fat-soluble vitamins from the digestive system, defends against disease by filtering out microorganisms
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Lymph
• A fluid similar in composition to blood plasma
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Lymph
• A fluid similar in composition to blood plasma• When blood passes through capillaries,
plasma leaks out, becoming interstitial (“between the cells”) fluid
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Lymph
• A fluid similar in composition to blood plasma• When blood passes through capillaries,
plasma leaks out, becoming interstitial (“between the cells”) fluid
• This fluid needs to be returned to the blood or it will accumulate in the tissues, causing edema
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Lymph
• A fluid similar in composition to blood plasma• When blood passes through capillaries, plasma
leaks out, becoming interstitial (“between the cells”) fluid
• This fluid needs to be returned to the blood or it will accumulate in the tissues, causing edema
• Once the interstitial fluid enters the lymph capillaries, it is called lymph
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Lymphatic Vessels• Carry fluid only in one direction (away from
the tissues, toward the heart). Like veins, they have valves that prevent backflow.
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Lymphatic Vessels• Carry fluid only in one direction (away from
the tissues, toward the heart). Like veins, they have valves that prevent backflow.
• Lymph capillaries: smallest lymphatic vessels.
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Lymphatic Vessels• Carry fluid only in one direction (away from
the tissues, toward the heart). Like veins, they have valves that prevent backflow.
• Lymph capillaries: smallest lymphatic vessels. • Capillaries merge to form lymphatic vessels,
which merge into lymphatic trunks, which lead to the two lymphatic ducts
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Lymphatic Vessels• Carry fluid only in one direction (away from
the tissues, toward the heart). Like veins, they have valves that prevent backflow.
• Lymph capillaries: smallest lymphatic vessels. • Capillaries merge to form lymphatic vessels,
which merge into lymphatic trunks, which lead to the two lymphatic ducts
• Right lymphatic duct drains the upper right quadrant of the body. Thoracic duct drains remaining ¾ of body.
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Lymphatic Vessels• Carry fluid only in one direction (away from the
tissues, toward the heart). Like veins, they have valves that prevent backflow.
• Lymph capillaries: smallest lymphatic vessels. • Capillaries merge to form lymphatic vessels, which
merge into lymphatic trunks, which lead to the two lymphatic ducts
• Right lymphatic duct drains the upper right quadrant of the body. Thoracic duct drains remaining ¾ of body.
• Both ducts empty into the subclavian vein
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Lymphatic Organs
1. Lymph nodes
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Lymphatic Organs
1. Lymph nodes – small, bean shaped structures
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Lymphatic Organs
1. Lymph nodes: – small, bean shaped structures– Widely distributed throughout the body along the
lymphatic pathways
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Lymphatic Organs
1. Lymph nodes: – small, bean shaped structures– Widely distributed throughout the body along the
lymphatic pathways– Most numerous in the neck, armpit, and groin
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Lymphatic Organs
1. Lymph nodes: – small, bean shaped structures– Widely distributed throughout the body along the
lymphatic pathways– Most numerous in the neck, armpit, and groin– Function: Filter the lymph
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Lymphatic Organs
1. Lymph nodes: – small, bean shaped structures– Widely distributed throughout the body along the
lymphatic pathways– Most numerous in the neck, armpit, and groin– Function: Filter the lymph– Contain lymphocytes and macrophages, which
remove bacteria, viruses, cancer cells, and damaged cells
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2. Tonsils
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2. Tonsils–Clusters of lymphatic tissue
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2. Tonsils–Clusters of lymphatic tissue–3 pairs of tonsils (pharyngeal, palatine, and
lingual)
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2. Tonsils–Clusters of lymphatic tissue–3 pairs of tonsils (pharyngeal, palatine, and
lingual)–Contain lymphocytes and macrophages,
which destroy pathogens that enter through the nose or mouth
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3. Spleen– Largest lymphatic organ
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3. Spleen– Largest lymphatic organ–Curves around the left side of the stomach
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3. Spleen– Largest lymphatic organ–Curves around the left side of the stomach– Filters the blood (in the same way the
lymph nodes filter the lymph)
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3. Spleen– Largest lymphatic organ–Curves around the left side of the stomach– Filters the blood (in the same way the
lymph nodes filter the lymph)–Acts as a reservoir for blood
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4. Thymus–Gland located behind the sternum
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4. Thymus–Gland located behind the sternum– Involved in maturation of T-lymphocytes
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4. Thymus–Gland located behind the sternum– Involved in maturation of T-lymphocytes–Produces the hormone thymosin
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Diagram (pg 3)
• Label as a class