Question

226 Give reasons for the following
a) The muscular walls of ventricles are thicker than the walls of
auricles
b) Arteries have thick elastic walls
c) Veins have valves​

Answer 1

Answer:

6 Give reasons for the following

a) The muscular walls of ventricles are thicker than the walls of

auricles

b) Arteries have thick elastic

Explanation:

auricles

b) Arteries have thick elastic walls

c) Veins have valves vb

Answer 2

Explanation:

a.Since ventricle have to pump blood into various organs and the pressure of blood flowing in them is more than that of auricles. Therefore, ventricle have thicker walls rather than auricles

b.It is because blood flow here with more pressure and speed .

c. Blood in valve is under less pressure as it is running to the heart from various organs and tissues and has a risk of back flow if the valves are not present to prevent it.