MICROANATOMY

BLOOD CARDIOVASCULAR SYSTEM LYMPHOID ORGANS

CARDIOVASCULAR SYSTEM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
During exercise the skin reddens because ____
A
Sweat is red
B
Capillaries close to the surface expand to release heat
C
The skin is cold
D
None of the above
Explanation: 

Detailed explanation-1: -Movement means artery health improvement Exercising muscles need more blood. And in response to regular exercise, they actually grow more blood vessels by expanding the network of capillaries. In turn, muscle cells boost levels of the enzymes that allow them to use oxygen to generate energy.

Detailed explanation-2: -Your heart will beat faster, which increases blood flow to your muscles. Your small blood vessels will widen to deliver more oxygen to your muscles and carry away carbon dioxide and other waste products that build up. It is this widening of the blood vessels that causes the flushing of your skin during exercise!

Detailed explanation-3: -During activity, blood pressure increases as the demand for oxygen to be delivered to the working muscles rises. In order to meet the rise in demand of oxygen to be delivered, an increase in capillaries occurs.

Detailed explanation-4: -The heat generated in contracting muscles is transferred, because of circulation of blood, to the skin surface; thus, skin surface temperature is elevated by the increased SkBF.

There is 1 question to complete.