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The lymphatic system and Body Defenses
HAP1 study
13
Anatomy
Undergraduate 1
06/12/2013

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Term
The lymphatic is a one-way system. True of False?
Definition
True!
Term
What are the functions of the lymphatic system?
Definition
1. To transport leaked fluid back into the blood system
2. To defend the body against diseases
Term
How is fluid leaked into body tissues?
Definition
Through hydrostatic pressure and mini valves in lymph capillaries.
Term
What is the process of fluid absorption?
Definition
fluid->lymph capillaries->lymphatic collecting vessels->lymph nodes->right thoracic duct of the Thoracic duct into the venous system
Term
Where do the lymphatics of the head, neck, and right arm drain into, in order to get back into the blood stream?
Definition
The Right Thoracic Duct.
Term
Thoracic Duct
Definition
Drains lymph from everywhere in the body excluding the right arm, head, and neck.
Term
How does lymph move around the body?
Definition
Muscle and respiratory pumps, and smooth muscle contraction in larger lymphatic vessels.
Term
Tell me about lymph nodes:
Definition
They are part of the lymphatic system and have four entry point but only two exit point. Lymph nodes contain macrophages (digest harmful substances) and lymphocytes (involved with immunity).
Term
What are the lymphatic organs?
Definition
The spleen, Peyer's Patches (small intestine), the tonsils, thymus, and appendix.
Term
What is the function of the spleen?
Definition
Cleans the blood, responsible for RBC break down, stores platelets, and can contract if an accident has occurred and the body is loosing blood.
Term
What are the two lines of body defence?
Definition
Innate and Adaptive
Term
What are innate defences?
Definition
The skin-sebum, keratin, melatonin, acid-mantle, mucous membranes, cilia, gastric juices, lacrimal secretion (tears), nasal hair, saliva.
Cellular and chemical: phagocytes, natural killer cells (lyse cancer and virus cells), the inflammatory response, fever, acidic fluids, interferons, and complement.
Term
What are the four cardinal signs of inflammation?
Definition
1. Redness from increased blood flow to the area
2. Heat from increased blood flow, which is warm
3. Swelling from leaky capillaries
4. Pain from leaky capillaries activating pain receptors
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