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प्रश्न
Explain the following:
Why is the closed circulatory system more efficient than the open system?
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उत्तर
The closed circulatory system is more efficient than the open system because in closed system the blood flows inside arteries or veins all the time which stops the mixing of blood with other bodily fluids and helps the transport of the blood around the body.
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संबंधित प्रश्न
The diagram given below represents a section of the human heart. Answer the questions that follow :
(i) Which parts of heart are in the diastolic phase? Give a reason to support your answer.
(ii) Label the parts numbered 1 and 2 in the diagram. What type of blood flows through them?
(iii) What causes the heart sounds ‘LUBB’ and ‘DUP’?
(iv) Name the blood vessels that supply oxygenated blood to the heart muscles.
(v) Draw neat labelled diagrams of a cross section of an artery and a vein.
fill in the blanks with suitable functions: Eustachian Tube and ______
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
Angina pectoris is due to
What are the average values of blood pressure in a normal adult human?
The valve which prevents back flow of blood in the veins and lymph vessels ______.
Draw a neat and labelled diagram.
Internal structure of the heart.
Blood consists of two parts - a liquid part and a cellular part. Name these parts and briefly write about them
Describe the functions of the: Blood
______ prevent blood clotting.
