Advertisements
Advertisements
Question
Veins have valves that allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?
Advertisements
Solution
Blood flow in arteries is rapid as the blood in them is under great pressure. Thick elastic walls of arteries are not collapsible and maintain one direction rapid flow.
APPEARS IN
RELATED QUESTIONS
What are the components of blood?
What makes the blood look red?
Name the following:
Components of blood
State the Function: Vitamin K
A patient with blood group O was injured in an accident and has blood loss. Which group of blood should be used by the doctor for transfusion?
Direction: In each of the following questions a statement of assertion (A) is given and a corresponding statement of Reason (R) is given just below it. Mark the correct statement as.
Assertion: RBC plays an important role in the transport of respiratory gases.
Reason: RBC does not have cell organelles and a nucleus.
Single circulation i.e. blood flows through the heart only once during one cycle of passage through the body, is exhibited by
The blood leaving the tissues becomes richer in
Name the organ which is located in the chest cavity with its lower tip slightly tilted towards the left.
Find out about blood groups and their importance.
