Asked by GURPREET SINGH on May 07, 2024
Verified
Capillaries have the slowest velocity because
A) the total cross-sectional area is the smallest.
B) the resistance is the greatest.
C) the total cross-sectional area is the largest.
D) their diameters are the smallest.
Cross-sectional Area
The area of a particular section of an object or substance, usually measured perpendicular to a specific axis.
Capillaries
The smallest blood vessels in the body which facilitate the exchange of water, oxygen, carbon dioxide, and many other nutrient and waste chemical substances between blood and the tissues.
Velocity
A physical vector quantity that denotes the rate of change of position of an object with respect to time, including both speed and direction.
- Explain the circulation and speed of blood within various categories of blood vessels.
- Comprehend the architecture and role of capillaries, along with the mechanisms of capillary exchange.
Verified Answer
RC
RONGZHENG CHENGMay 12, 2024
Final Answer :
C
Explanation :
Capillaries have the slowest velocity of blood flow because their total cross-sectional area is the largest when all capillaries are considered together. This large area slows down the blood flow, allowing more time for exchange processes between blood and tissues.
Learning Objectives
- Explain the circulation and speed of blood within various categories of blood vessels.
- Comprehend the architecture and role of capillaries, along with the mechanisms of capillary exchange.