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Difficulty: EasyHuman Anatomy and Body Systems

In the human circulatory system, which type of blood vessel is equipped with internal one-way valves to prevent the backflow of blood as it returns toward the heart?

  1. A
    Arteries
  2. VeinsAnswer
  3. C
    Capillaries
  4. D
    Arterioles

Answer

Veins
Veins are the blood vessels responsible for returning blood to the heart. Because blood pressure within the venous network is low, veins feature one-way valves that work alongside surrounding skeletal muscle contractions to ensure blood flows unidirectionally toward the heart without flowing backward.

Step-by-Step Solution

1
Identify the hemodynamic pressure conditions in blood vessels returning to the heart
Blood returning to the heart travels through the venous system under significantly lower pressure than blood leaving the heart.
After passing through capillary beds, blood loses most of the kinetic force imparted by the pumping ventricles.
2
Determine the anatomical adaptation required to maintain unidirectional flow under low pressure
Veins contain specialized semilunar folds of the tunica intima forming one-way valves.
These valves permit forward movement toward the heart while snapping shut to prevent retrograde flow caused by gravity.

Key Concept

Venous valve function and structural differences among blood vessel classes
Estimated Time:45s
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Topics

Human Anatomy and Body Systems

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