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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.
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उत्तर
(i) Ventricles are in diastolic phase. The arrows indicate blood entering the ventricles. During a ventricular diastole, the valves between atria and ventricles open which allow the entry of blood into the ventricles.
(ii) 1 – Pulmonary artery, 2 – Pulmonary veins
(iii) Closing of the bicuspid and tricuspid valves causes the ‘LUBB’ sound, and the closing of semilunar valves causes the ‘DUP’ sound.
(iv) Coronary artery supplies oxygenated blood to the heart muscles.
(v) Cross-section of an artery and a vein:
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संबंधित प्रश्न
the Biological/technical term for The vein which drains the blood from the intestine to the liver.
Which side of the heart (left or right) contains oxygenated blood?
Agranulocytes are :
Name the following:
The artery which carries deoxygenated blood.
Name the following:
The kind of blood cells which can squeeze out through the walls of one category of blood vessels.
Give reason for the following:
Atrial wall is less muscular than the ventricular wall.
Fill in the blanks with suitable words given below:
The two lower chambers of the heart are called ______.
Describe the functions of the: Blood
Assertion (A): RBCs help in the transport of respiratory gases.
Reason (R): The cytoplasm of RBCs contains the respiratory pigment Haemoglobin.
Hematocrit is ______.
