Questions and Answers
What defines a simple pathway?
What is an example of a simple pathway?
Spleen
Arteries that provide only one pathway through which blood can reach an organ are referred to as?
End arteries
Alternative pathways differ from the simple pathway in the number of?
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Three of the alternative pathways are designated as?
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What is an anastomosis?
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What do arterial anastomoses include?
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What do venous anastomoses include?
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Veins tend to form more of what than arteries?
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Veins that drain the upper limb are?
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What are arteriovenous anastomoses?
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Where are these shunts present?
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What is a different type of blood vessel arrangement for the alternative pathway?
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What describes a portal system?
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A portal vein delivers blood to another organ first before?
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Why is it better to have the anastomoses pathway if an artery becomes occluded?
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Study Notes
Simple Pathway
- A major artery delivers blood to an organ, branching into smaller arteries, leading to arterioles.
- Each arteriole feeds into a single capillary bed, and venules drain blood from the capillaries to form a major vein.
- Example: Spleen.
End Arteries
- Arteries providing a single pathway for blood to an organ or region are known as end arteries.
Alternative Pathways
- Alternative pathways differ from simple pathways in the number of arteries, capillary beds, or veins serving a specific organ or body region.
- Three types of these are known as anastomoses.
Anastomoses
- Anastomoses refer to the joining together of blood vessels, allowing multiple pathways for blood flow.
- Types include arterial anastomoses and venous anastomoses.
Arterial Anastomoses
- Involve two or more arteries converging to supply the same body region, providing redundancy in blood supply.
Venous Anastomoses
- Include two or more veins draining the same body region, allowing for flexibility in venous return.
Vein Characteristics
- Veins tend to form more anastomoses compared to arteries, enhancing blood flow variability.
Upper Limb Veins
- Veins draining the upper limb include basilic, brachial, and cephalic veins.
Arteriovenous Anastomoses
- Also known as shunts, they transport blood directly from an artery into a vein, bypassing the capillary bed.
- Found in fingers, toes, palms, and ears, these are important for thermoregulation, allowing blood to bypass certain areas when the body is cold.
Portal System
- A distinct blood vessel arrangement where blood flows through two capillary beds separated by a portal vein.
- The portal vein delivers blood to one organ before returning to the heart.
Benefits of Anastomoses
- If an artery is occluded, anastomoses provide alternative blood routes to ensure that the organ continues to receive adequate blood supply.
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Description
Test your knowledge on the pathways of blood vessels with these flashcards. Learn about simple pathways, examples, and their functions within the circulatory system. Perfect for students studying anatomy and physiology.
