Question

Can you explain this concept. I'm confused by this image

Countercurrent exchange happens if veins and arteries are not next to one another (b) Blood flow with countercurrent heat exchange con 37° 29° 22° 36° 2° 21° དང་ད༌དད༽ཉགངཤ་ར་ར ༨༽ར་ TA = 5°C ANIMAL PHYSIOLOGY. Figure 8.29 2004 Sauer Associates, Inc (a) Blood flow without countercurrent heat exchange 37° 32° 28° 16° 18° 21 San TA=5°C

Answer 1

Answer. :- Blood flowing from the center of the body to the periphery (such as legs & feet) brings heat that can easily be lost through the skin. However, the vein that carries blood to the heart of the body lies opposite the artery that brings blood to its feet. Energy travels to the cooler venous blood by conducting from the warmer arterial blood. Although the arterial blood cools on its way to the foot, it's always cooler than the venous blood next to it. Thus, heat travels across the vessels as blood in the veins flows counter to blood in the arteries. Venous blood absorbs heat from the blood on its way back to the body as the former warms up.