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Lymphatic/Homeostasi
Lymph and Tissue Fluid
| Question | Answer |
|---|---|
| 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
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