Summary
Arteries carry blood away from the heart, veins return it and capillaries exchange materials.
In depth
Arteries have thick elastic and muscular walls; veins have thinner walls, larger lumen and valves; capillaries are one cell thick for exchange. Blood pressure falls from arteries to veins. Muscle contractions help return blood.
Vessel structure suits function: arteries withstand pressure; capillaries allow exchange; veins act as reservoirs. Vasoconstriction and vasodilation regulate flow.
Key idea: total capillary area is huge but blood moves slowly there to allow exchange.
Frequently asked questions
What is Blood Vessels?
Arteries carry blood away from the heart, veins return it and capillaries exchange materials.
Which area of biology covers Blood Vessels, and how advanced is it?
Blood Vessels is one of the 51 topics in Human Physiology. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include Heart Structure, Gas Exchange in Alveoli, Lymphatic System.
Can you give an example of Blood Vessels?
Varicose veins have faulty valves.
What should I learn before Blood Vessels?
Blood Vessels is a Beginner topic, so no earlier topic is required. Other Beginner topics in Human Physiology that pair well with it include Homeostasis, Tissues and Organs, Skeletal System.
What topics are related to Blood Vessels?
The closest topics to Blood Vessels are Heart Structure, Gas Exchange in Alveoli, Lymphatic System, Circulatory System. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Blood Vessels?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Blood Vessels. To practise the whole of Human Physiology, use the Human Physiology quiz.
How is Blood Vessels different from Heart Structure?
Blood Vessels: Arteries carry blood away from the heart, veins return it and capillaries exchange materials. Heart Structure: A four-chambered muscular pump with atria, ventricles and valves that keep blood flowing one way. Read both side by side and note what each one explains.
How should I study Blood Vessels step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Heart Structure and explain the difference aloud. Finally, take the Human Physiology quiz and come back to this page for any question you miss.