Asked by Erika Cobarrubias on Jun 15, 2024
Verified
What is the most significant factor in determining the peripheral resistance in a blood vessel?
A) Hematocrit
B) Blood vessel diameter
C) Blood viscosity
D) Blood vessel length
E) All of these factors contribute equally to the peripheral resistance in a blood vessel.
Peripheral Resistance
The resistance to blood flow in the circulatory system, primarily determined by the diameter and elasticity of blood vessels.
Hematocrit
Hematocrit is a measure of the volume percentage of red blood cells in the blood, used in diagnosing and monitoring various medical conditions.
Blood Viscosity
A measurement of the resistance of blood to flow, which can affect blood pressure and circulation, influenced by factors such as hematocrit and plasma protein levels.
- Understand the factors influencing peripheral vascular resistance and their impact on blood circulation.
Verified Answer
MS
Mabel SchraderJun 16, 2024
Final Answer :
B
Explanation :
Blood vessel diameter is the most significant factor in determining peripheral resistance. As the diameter of the blood vessel decreases, the resistance increases, and as the diameter increases, the resistance decreases. This is due to the relationship between the cross-sectional area of the vessel and the flow rate of the blood. Blood viscosity, hematocrit and blood vessel length also contribute to peripheral resistance, but to a lesser degree. Therefore, option B is the most appropriate choice.
Learning Objectives
- Understand the factors influencing peripheral vascular resistance and their impact on blood circulation.