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Elastic arteries are closest to the heart and expand and contract to control blood pumping from the heart and to maintain blood pressure.
Next is muscular arteries that are mostly muscle that control flow to organs and tissues.
Arterioles are nextand change size based on sypathetic or endocrine system (ex: fight or flight) and allow more or less blood to reach the capillaries and be exchanged.
The blood then flows into the capillaries.
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∙ 12y ago
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What structures in capillary beds open to allow the capillaries to perfuse with blood?
precapillary sphincters
What is the difference between arteriole and venule blood flow?
An arteriole transports oxygenated blood from the arteries to the capillary beds and a venule transports de-oxygenated blood from the capillary beds to the veins.
Are all capillary beds continuously perfused with blood?
No
What are the blood vessels that drain blood directly from the capillary beds?
venule(veins)
What do sphincters in capillary beds do?
They can control gas exchange in the tissues. When they are constricted, there is almost complete no gas exchange. The blood just bypasses the tissues.
Is it true that all capillary beds are continuously perfused with blood?
Yes
What blood vessels connect networks of capillary beds?
portal veins
Why are capillary beds important?
it helps you maintain your life
How do you trace the flow of blood from the left ventricle to capillary beds?
The blood flows from the left ventricle into elastic arteries (aortic trunk), then to the muscular arteries (external carotid artery), then to arterioles, then to the capillary beds.
Do exchanges between blood and tissue cells occur in capillary beds?
yes
How many capillary beds does blood go through on each circuit from the heart and back to the heart?
On one fill circuit, the blood will go through two capillary beds, one of which is at the end organ, and the other is in the lungs.
How it is possible to bypass capillary by shunting blood directly from arteriole to venules?
this is possible because there are alternate branches that bypass capillary beds.
