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प्रश्न
What is meant by the term 'double circulation' of blood in mammals? What is diastole?
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उत्तर
Blood flows twice in the heart before it completes one full cycle. This process of blood circulation in the human body is called double circulation.
The expansion or relaxation phase of the atria is called a diastole.
संबंधित प्रश्न
Name the following:
The smallest common blood vessels formed by the union of capillaries.
Why do people have a common belief that the heart is located on the left side of the chest?
What is the function of spleen?
Give reason for the following:
The blood groups of both the donor and recipient must be known before transfusing blood.
Give reason for the following:
Atrial wall is less muscular than the ventricular wall.
Fill in the blanks with suitable words given below:
The blood loaded with carbon dioxide from the body comes into the ______ of the heart.
Why is a person having blood group AB called universal recipient and a person with blood group O called a universal donor?
What are seen as greenish blue lines in our hands and legs?
Analogy
Arteries : Carry blood from the heart:: _________ :carry blood to the heart.
Given below are four statements regarding human blood circulatory system:-
- Arteries are thick walled and have narrow lumen as compared to veins.
- Angina is acute chest pain when the blood circulation to the brain is reduced.
- Persons with blood group AB can donate blood to any person with any blood group under ABO system.
- Calcium ions play a very important role in blood clotting.
Which two of the above statements are correct?
