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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
State the exact location of the Chordae tendinae
Give any three differences between an artery and a vein
Fill in the blank:
In human body, heart is located on the _____ side of the chest cavity.
Match the statements in Column A with those in Column B
| Column A | Column B | ||
| 1 | Heart | a | Movement of materials |
| 2 | Food and oxygen | b | Channels for transport in man |
| 3 | Carrier of oxygen | c | A living pump |
| 4 | Circulation | d | Materials needed by every living being |
| 5 | Arteries and veins | e | Red blood cells |
Name the main parts of the circulatory system
Veins have valves at intervals in their inner lining whereas the arteries do not have valves. Explain.
Differentiate between:
Arteries and Veins.
Agranulocytes are about ______ % of total WBCs.
Identify the normal haemoglobin count in human females.
The valve which prevents back flow of blood in the veins and lymph vessels is ______.
