Walls of the heart

Question 1

Whose muscular wall are thinner atria or ventricles

Answer 1

The muscular walls of the atria are thinner than those of the ventricles

Question 2

When the atria contract, the thin muscular walls do not generate much pressure, but enough to force blood down into the ventricles, through the

Answer 2

atrioventricular valves

Question 3

In contrast, the walls of the ventricles are thicker and more muscular
Following contraction of the atria, the ventricles contract and squeeze blood inwards, increasing its ……………..and pushing it out of the heart through right and left ………………valves

Answer 3

pressure

semilunar

Question 4

The muscle of the left ventricle is significantly ……………than the right ventricle

This is because

Answer 4

thicker

This is because the blood leaving the right ventricle travels less distance than blood leaving the left ventricle

The blood pumped out from the right ventricle travels to the lungs, whereas blood leaving the left ventricle has to travel to the rest of the body to deliver oxygen for respiration.

To reach the rest of the body, the blood leaving the left ventricle must be under high pressure
This is generated by the contraction of the muscular walls of the left ventricle

Question 5

The right ventricle generates less pressure from the contraction of its thinner walls, as

Answer 5

blood only has to reach the lungs