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प्रश्न
What does the term “double circulation” mean?
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उत्तर
Blood flows twice in the heart before it completes one full round. The full round thus includes
pulmonary and systemic circulation. In pulmonary circulation, blood enters the lungs through
pulmonary arteries. Pulmonary veins collect the blood from the lungs and carry it back to the
left atrium.
In systemic circulation, blood from the left ventricle enters the aorta through which the blood is
sent to the body parts. From the body parts blood is collected by veins and sent back to the heart.
Therefore, the blood circulation in the human body is called double circulation.
संबंधित प्रश्न
Give biological reasons for the following statements:
The left ventricle of the heart has a thicker wall than the right ventricle.
Give appropriate biological or technical terms for the following
The relaxation phase of the heart.
MULTIPLE CHOICE TYPE:
(Select the most appropriate option)
The valve present between the right atrium and the right ventricle is the
(a) tricuspid valve
(b) bicuspid valve
(c) semi-lunar valve
(d) mitral valve
Give reason for the following:
Atrial wall is less muscular than the ventricular wall.
Given diagram shows a simple diagram of the circulation of blood in a mamma showing the
main blood vessels, the heart, lungs and body tissues. The blood vessel, labelled 6, contains
deoxygenated blood and the valve leading to it has three semi-lunar pockets.
(a) Name the blood vessels and organs marked by numbers 1 to 8.
(b) What is meant by the term ‘double circulation’ of blood in mammals?
(c) what is diastole?
[There is an “error” in the diagram. According to the usual practice the pulmonary (lung)
circulation is shown upward and the systemic downward, but here it is reversed].
Explain with reasons.
Human blood is red coloured.
Describe the functions of the: Blood vessels
Which of the following health condition refers to the type of blood cancer in which uncontrolled increase in number of WBCs occurs?
The lymphatic system consists of which of the following?
Identify the CORRECT statement/s regarding blood clotting.
