What is a capacitance vessel?
Capacitance vessels are consid- ered to be the blood vessels that con- tain most of the blood and that can readily accommodate changes in the blood volume. They are generally considered to be veins.
What are resistance vessels?
A resistance artery is small diameter blood vessel in the microcirculation that contributes significantly to the creation of the resistance to flow and regulation of blood flow. Resistance arteries are usually small arteries or arterioles and include precapillary sphincters.
What type vessel is called a capacitance vessel?
Characteristic feature: Veins are known as capacitance vessels because they are capable of storing a significantly larger volume of blood than arteries due to their large lumen and high compliance.
What are the differences between the three blood vessels?
Arteries transport blood away from the heart. Veins return blood back toward the heart. Capillaries surround body cells and tissues to deliver and absorb oxygen, nutrients, and other substances.
Why are veins termed capacitance vessels and arteries termed resistance vessels?
As the blood flows into smaller arteries and arterioles, the pulsatility declines. Regarding the distribution of blood volume within the circulation, the greatest volume resides in the venous vasculature, where 70-80% of the blood volume is found. For this reason, veins are referred to as capacitance vessels.
What are capacitance and resistance vessels?
The resistance vessels include small arteries, arterioles, and precapillary sphincters. Capacitance vessels include small and large veins. Capacitance vessels have great capacity to distend. For a similar rise in pressure, capacitance vessels may accommodate 20 times more blood than resistance vessels.
What are the structural differences between different types of blood vessels?
Vessel Comparison
- Arteries have thick walls and narrow lumens because they transport blood at high pressure.
- Capillaries have walls that are only a single cell thick because they exchange materials between blood and tissue.
- Veins have thin walls with wide lumens and valves because they transport blood at low pressure.
What is a capacitance vessel quizlet?
Terms in this set (20) Capacitance vessels A.k.a. Veins. The path of the blood from the right ventricle of the heart to the lungs and back to the left atrium.
Why are veins called resistance vessels?
Approximately 50-70% of the pressure drop along the vasculature occurs within the small arteries and arterioles. By the time blood reaches the capillaries the mean pressure may be 25-30 mmHg, depending upon the organ. The pressure falls further as blood travels into the veins and back to the heart.