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Blood Circulation Flashcards
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Blood circulation moves oxygen, nutrients, and waste products around the body through three distinct pathways: systemic, pulmonary, and portal circulation. This flashcard set covers how each pathway works, which vessels are involved, and what happens at key exchange points such as the capillaries and liver sinusoids.
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What are the three main types of blood circulation mentioned?
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Question
What are the three main types of blood circulation mentioned?
Answer
The three main types of blood circulation are systemic circulation, pulmonary circulation, and portal circulation.
Question
Describe systemic circulation.
Answer
Systemic circulation carries oxygenated blood from the left ventricle to the body and returns deoxygenated blood to the right atrium. It involves the aorta, systemic arteries, arterioles, systemic capillaries, venules, and systemic veins.
Question
What is the role of systemic capillaries?
Answer
In systemic tissues, systemic capillaries are where the exchange of nutrients and gases occurs. Blood unloads oxygen (O2) and picks up carbon dioxide (CO2).
Question
Describe pulmonary circulation.
Answer
Pulmonary circulation brings deoxygenated blood from the right ventricle to the lungs and returns oxygenated blood to the left atrium. It involves the pulmonary trunk, pulmonary arteries, capillaries around the alveoli, venules, and pulmonary veins.
Question
What is unique about pulmonary veins?
Answer
Pulmonary veins are the only veins that carry oxygenated blood.
Question
What is portal circulation?
Answer
Portal circulation involves venous blood passing from capillary beds in the digestive system, spleen, and pancreas, which is collected by the portal vein and delivered to the liver.
Question
What is a portal vein?
Answer
A portal vein is a vein that carries blood from one capillary network to another.
Question
How does blood flow through the liver in portal circulation?
Answer
Venous blood from the digestive system, spleen, and pancreas enters the liver via the portal vein. The liver also receives oxygenated blood from the hepatic artery. This mixes in the sinusoids, and blood eventually leaves through the hepatic veins.
Question
What is the purpose of blood circulation through the liver in portal circulation?
Answer
In portal circulation, blood with a high concentration of nutrients absorbed from the stomach and intestines goes to the liver first for processing.
Frequently Asked Questions About Blood Circulation Flashcards
What are the three types of blood circulation?
The three main types are systemic circulation, pulmonary circulation, and portal circulation. Systemic circulation moves oxygenated blood from the left ventricle to the body and returns deoxygenated blood to the right atrium. Pulmonary circulation carries deoxygenated blood to the lungs and returns oxygenated blood to the left atrium. Portal circulation routes blood from the digestive organs through the liver before it rejoins general circulation.
How does pulmonary circulation differ from systemic circulation?
Pulmonary circulation runs from the right ventricle to the lungs and back to the left atrium, while systemic circulation runs from the left ventricle to the rest of the body and back to the right atrium. One key distinction is that pulmonary arteries carry deoxygenated blood and pulmonary veins carry oxygenated blood, which is the reverse of what arteries and veins do in systemic circulation.
What is portal circulation and why does blood go to the liver first?
Portal circulation is the pathway by which venous blood from the digestive system, spleen, and pancreas travels through the portal vein to the liver before returning to general circulation. Blood goes to the liver first because it carries a high concentration of nutrients absorbed from the stomach and intestines, and the liver processes those nutrients. The liver also receives oxygenated blood via the hepatic artery, and both supplies mix in the sinusoids before leaving through the hepatic veins.
What is the role of capillaries in blood circulation?
Capillaries are the site of exchange between the blood and surrounding tissues. In systemic circulation, blood unloads oxygen and picks up carbon dioxide at the capillary beds. In pulmonary circulation, the capillaries surrounding the alveoli in the lungs allow carbon dioxide to leave the blood and oxygen to enter it.
Which veins carry oxygenated blood?
Pulmonary veins are the only veins in the body that carry oxygenated blood. All other veins carry deoxygenated blood back toward the heart. This makes pulmonary veins unique within the circulatory system.
What is a portal vein?
A portal vein is a vein that carries blood from one capillary network directly to another, rather than returning blood to the heart first. The hepatic portal vein is the best-known example, connecting the capillary beds of the digestive organs to the sinusoids of the liver.
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