Asked by Thomas Gordon on May 24, 2024
Verified
Which of the following statements regarding regulation of local blood flow is true?
A) Increased metabolic rate in a tissue increases capillary blood flow into the tissue.
B) Blood flow through capillaries is continuous.
C) Contraction of precapillary sphincters will increase blood flow to a capillary bed.
D) Increased levels of CO2 increase the contraction of precapillary sphincters.
E) Tissue need for O2 and amino acids will cause precapillary sphincters to contract.
Metabolic Rate
The rate at which the body uses energy to maintain basic vital functions such as breathing, circulation, and cell production.
Precapillary Sphincters
Ring-like muscles located at the entrance of capillaries, controlling blood flow into the capillaries by contraction and relaxation.
- Understand the principles of Poiseuille's law and its effects on the dynamics of blood flow and the dimension of blood vessels.
- Understand the importance of blood viscosity and vessel diameter in influencing cardiovascular resistance.
Verified Answer
DM
Dominique McCrayMay 27, 2024
Final Answer :
A
Explanation :
Increased metabolic activity in a tissue leads to increased demand for oxygen and nutrients, which is met by increasing the blood flow to that tissue. This is achieved through mechanisms such as vasodilation of arterioles and relaxation of precapillary sphincters, allowing more blood to flow into the capillaries supplying the tissue.
Learning Objectives
- Understand the principles of Poiseuille's law and its effects on the dynamics of blood flow and the dimension of blood vessels.
- Understand the importance of blood viscosity and vessel diameter in influencing cardiovascular resistance.