Summary
The heart, blood vessels and blood that transport materials around the body.
In depth
Double circulation: the pulmonary circuit carries blood to the lungs and back; systemic delivers it to the body. This keeps oxygenated and deoxygenated blood separate, giving high pressure to tissues.
Blood flows in one direction because of valves. The lymphatic system returns fluid. Circulation delivers oxygen, nutrients and hormones, removes wastes.
Key idea: a double circulation keeps pressures appropriate for lungs and body.
Frequently asked questions
What is Circulatory System?
The heart, blood vessels and blood that transport materials around the body.
Which area of biology covers Circulatory System, and how advanced is it?
Circulatory System 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, Lymphatic System, Blood Components.
Can you give an example of Circulatory System?
The heart beats about 100,000 times a day.
What should I learn before Circulatory System?
Circulatory System 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 Circulatory System?
The closest topics to Circulatory System are Heart Structure, Lymphatic System, Blood Components, Blood Vessels. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Circulatory System?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Circulatory System. To practise the whole of Human Physiology, use the Human Physiology quiz.
How is Circulatory System different from Heart Structure?
Circulatory System: The heart, blood vessels and blood that transport materials around the body. 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 Circulatory System 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.