Human Body Exam 4

Human Body Exam 4 - Human Body Exam#4 The Lymphatic System...

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Human Body Exam #4: The Lymphatic System Functions: Digestion (break down of fats), Defense, Returns fluid (plasma) to the blood stream (the fluids lost from the capillaries. High blood pressure in capillaries causes fluid to leak out. The lymphatic system returns this fluid to the blood through osmosis. Albumins suck water back into the capillaries. You lose about 3 liters of water from your blood a day and the lymphatic works to return this water Structure: The fluid is called LYMPH. (Lymph is very similar to plasma. It is also very similar to extracellular/interstitial fluid). There are also lymphatic vessels that the lymph travels through. The lymph nodes are enlargements that hold WBCs. The lymph nodes filter the lymph that goes through them. Then there are lymphoid tissues and organs. (anything with wbc and rbc?) The lymphatic system is not a closed circuit. If someone has cancer, they look at their lymph nodes. This is an easy place for metastatic cancer cells to take place. There is no pump in the lymphatic system. How does this lymph travel? MUSCLES. Through the contraction of skeletal muscles. One way valves allow for the lymph to only move UP. The Respiratory System: Functions: Regulate pH of body fluids (blood), Production of sound (vocalization), Gas Exchange Respiration: Exchange of gas between the environment and your individual body cells. It can be broken into 4 steps: Breathing (ventilating): Moves air in and out of the lungs External Respiration: The exchange of oxygen and carbon dioxide between the lungs and the blood. External because its happening with the external environment. Gas Transport: Moves oxygen and carbon dioxide between the lungs and body tissues.
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Internal Respiration: The exchange of oxygen and carbon dioxide between blood and body tissues. Some include a 5 th step which is CELLULAR RESPIRATION. (Reminds us of why we need oxygen and where carbon dioxide comes from.) Structure: Upper Respiratory (throat and neck), Lower Respiratory tract (thoracic cavity) Upper Respiratory System: Helps to clean the air that you breathe in (bacteria, etc.) and conditions air.( warms and humidifies/moistens air.) The air is warmed by the blood vessels. Mucus will help to trap debris and push it back outside of the body to push it to the digestive tract to be killed. Conducts air: Moved from upper respiratory to lower Nose Pharynx (common tube, passageway for food, air, and drink.) Phar=Food/Air *Upper resp tract begins at the sinuses which are the cavities in the skull that lighten the head and warm and moisten the air. Then it goes through the nasal cavity which products mucus and filters warms and moistens air. It also works in olfaction. The pharynx is the passageway for air and food. o
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This note was uploaded on 02/14/2012 for the course BIO 309D taught by Professor Jessicawandelt during the Fall '08 term at University of Texas.

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Human Body Exam 4 - Human Body Exam#4 The Lymphatic System...

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