Question

Standing still can cause a person to faint because of inadequate return of blood to the heart via veins. Which of the following is NOT occurring to promote return of bland.

ventricular contractio or

skeletal muscle activily compressing veins and forcing blood flow

Answer 1

STATEMENT 2 -skeletal muscle activily compressing veins and forcing blood flow

Skeletal muscle is considered as the peripheral heart beacuse of there Pumping action.

During standing position , the blood are pooled in the lower part of the body, it reduces the return of blood to the heart.skeletal muscle have a pumping action in the return of blood through the vein .

when the skeletal muscle contract it will compresses the vein and produce enough force to pump the blood from the arterial circulation to venous circulation.

But during prolonged standing when the skeletal muscle activity is not there, the Heart doesnt get enough blood to pump to the periphery , so theblood flow to the brain is reduced resulting in the Hypoperfusion causes Fainting.

Ventricular contraction is the contraction of the ventricle to pump the blood out of the heart to the periphery.

Left ventricle contract during the systolic period and pump blood into the Aorta, from the Aorta blood is pumped into the systemic circulation for supplying the tissues.

Right ventricle contract during the systolic period and pump blood into the pulmonary artery. blood is taken into the lung for gaseous exchange and returned to the heart.

So, ventricular contraction result in the pumping of blood from the heart to the periphery.if the skeletal muscle pump is not working properly the heart dont get blood to pump during the ventricular contraction