2481481
Description
Flashcards by Chelsea Tucker, updated more than 1 year ago
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Created by Chelsea Tucker
about 9 years ago
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| Question | Answer |
| Capillaries cell walls are described as ______. | Semi-permiable. |
| What are capillaries? | They are really tiny blood vessels. |
| What does the capillary network do? | Capillaries receive blood from artiest and return it to veins. |
| How thick is the capillary wall? | They are one cell thick. |
| What is the purpose of capillaries having a thin cell wall? | The one cell thick wall of capillaries make it easier for gases to diffuse in and out of the capillaries. |
| What are capillary beds? | The networks of capillaries in tissue. |
| What happens to small molecules when blood passes through the capillaries? | When blood passes through capillaries small molecules like water, oxygen and glucose are forced out of the capillaries. |
| What do the small molecules forced out of the capillaries when blood flows through them form? | The small molecules form tissue fluid. This surrounds cells. |
| What is tissue fluid? | Plasma that is forced out of the blood as it passes through the capillary network. Tissue fluid carries dissolved chemicals from the blood to the cells. |
| Oxygen, water and glucose can be diffused from the tissue fluid to where? | The substances can diffuse out of the tissue fluid into cells. |
| Chemicals can also diffuses out of cells into the tissue fluid. Give an example. | Waste chemicals like carbon dioxide and urea diffuse out of the cells into the tissue fluid and then into the capillaries. |
| What are the purpose of arteries? | To carry blood away from the heart. |
| Describe the structure of an artery. | Arteries have thick muscular elastic walls to with-stand the high pressure of the blood passing through it. |
| What are veins? | The blood vessels which carry blood back to the heart. |
| Describe the structure of veins. | These vessels have large lumen, allowing them to carry a large amount of blood. The have thin walls and contain valves to prevent low pressure blood flowing the wrong way. |
| Name these blood vessels. | |
| What blood vessel joins arteries to veins? | Capillaries |
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