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Lymphatic/Homeostasi

Lymph and Tissue Fluid

QuestionAnswer
What is the function of the Lymphatic System? The lymphatic system collects the fluid that surrounds the cells in our bodies and returns it to the blood.
How does the fluid come to surround our cells? The fluid is caused by the high pressure in our arteries that forces plasma out of our capillaries.
Where is this fluid returned to the blood stream? The tissue fluid is returned to the bloodstream at the subclavian vein under the clavicle?
What drives the tissue fluid around the lymphatic system? Unlike the circulatory system the lymphatic system is not connected to the heart and relies on the contraction of skeletal muscle to drive the tissue fluid through lymph vessels.
Why do the lymphatic vessels contain valves? The contraction of skeletal muscle does not create a high pressure so the valves are necessary to prevent the backflow of tissue fluid.
What are lymph nodes? Lymph nodes are swellings found on lymph vessels. They filter bacteria from tissue fluid/lymph as it passes through. As lymph nodes mature they store lymphocytes. When pathogens invade the body our lymph nodes can become swollen as they fight infection.
What is homeostasis? Homeostasis is the ability of an organism to maintain a constant internal environment.
Give 4 examples of homeostasis in the human body. 1: Maintaining our body temperature at 37C. 2: Keeping the pH of our blood at roughly 7.4. 3: Preventing the build up of toxic chemicals in the body. 4: Maintaining oxygen levels in the body. 5: Keeping glucose levels in blood plasma close to 0.1%
What organs are responsible for homeostasis in the human body? 1: Body temperature is mainly controlled by our skin. 2: Levels in our plasma and pH are controlled by our kidneys. 3: Our liver and kidneys prevent a build up of toxins. 4: Heart rate and oxygen levels are monitored by the brain.
How is the rate of diffusion increases in larger organisms? 1: Leaves have a large flat surface. 2: Lungs and kidneys have large internal surface area. 3: Circulatory systems carry materials to the cells where they can diffuse rapidly.
What are the advantages of homeostasis? Homeostasis allows cells and organisms to function at a more efficient rate. It allows organisms to function independently of the external conditions. It allows for slight variation when necessary, eg increase in body temperature when we are sick.
Created by: cbsbiology