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प्रश्न
What prevents the backflow of blood inside the heart during contraction?
विकल्प
Thick muscular walls of ventricles
Valves
Thin walls of atria
All of the above
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उत्तर
Valves
During contraction, valves prevent the back-flow of blood inside the heart.
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संबंधित प्रश्न
What are the components of the transport system in human beings? What are the functions of these components?
Refer to fig. 7.3 and answer the following questions:
(i) Impure blood is received by
(ii) Which chamber has thickest wall
(iii) Function of bicuspid value
(iv) Function of tricuspid value
Match the terms given in column I with terms in Column II:
| Column I | Column Il |
| (i) Left-auricle | (a) Clotting |
| (ii) Right auricle | (b) Thebasius valve |
| (iii) Left ventricle | (c) Pulmonary vein |
| (iv) Right-ventricle | (d) Aorta |
| (v) Fibrin | (e) Pulmonary arch |
Choose the correct answer:
Which of the following engulfs pathogen rapidly?
The diagram given below represents the human heart in one phase of its activity. Study the same and then answer the question that follow:
Which part of the heart is contracting in this phase? Give a reason to support your answer.
Differentiate between:
Diastole and Systole.
Name the Following
Layer, which surrounds the heart.
Complete the following sentence with appropriate word:
In man (human), the heart has _____ chambers.
State the Function: Semilunar valves of the heart
Short answer question.
Describe valves of human heart.
How do the pulmonary artery and pulmonary vein differ in their function when compared to a normal artery and vein?
Complete the analogy.
The contraction of heart muscles: Systole:: Relaxation of heart muscles: ______.
In normal health condition, ventricular systole lasts for ______.
Blood capillaries show the presence of ______
Observe the diagram, Identify the parts labelled as P, Q, R, S. Choose the correct option for the conduction of cardiac impulse.
The kidney is located in the thoracic cavity between the two lungs.
The heart forms an effective barrier against infection by microbes and pathogens.
Draw the neat Labelled diagram of the internal structure of the human heart.
The rate of heartbeat is determined by ______.
Explain the term Ligamentum arteriosum.
