Advertisements
Advertisements
Question
What prevents the backflow of blood inside the heart during contraction?
Options
Thick muscular walls of ventricles
Valves
Thin walls of atria
All of the above
Solution
Valves
During contraction, valves prevent the back-flow of blood inside the heart.
APPEARS IN
RELATED QUESTIONS
The blood leaving the tissues becomes richer in:
Differentiate between:
Diastole and Systole.
Given alongside is a highly diagrammatic sketch of the internal structure of the human heart:
(i) Name the parts numbered 1-11.
(ii) What is the main difference in the quality of blood contained in parts 6 and 7?
State the Function: Pulmonary artery
The blood does not flow back into the ______ when mitral valve closes.
Match the items given in Column I (Valves) with those in Column II (Location) and select the correct option.
| Column I | Column II | ||
| i. | Tricuspid valve | a. | Between left atrium and left ventricle |
| ii. | Bicuspid valve | b. | Between right ventricle . and pulmonary artery. |
| iii. | Semilunar valve | c. | Between right atrium and right ventricle |
Identify the CORRECT statement with respect to serous pericardium.
Complete the analogy.
The contraction of heart muscles: Systole:: Relaxation of heart muscles: ______.
Fill in the blanks of the following paragraph using just two words – arteries and veins.
___(a)___ carry oxygen-rich blood from the heart to all parts of the body and ___ (b)___ carry carbon dioxide-rich blood from all parts of the body back to the heart. ___ (c)___ have thin walls and __ (d)___ have thick elastic walls. Blood flows at high pressure in ___ (e)____. Valves are present in __ (f) ___ which allow blood to flow only towards the heart. __ (g)___ divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form ____ (h)_____.
Give scientific reason.
Human heart is called as myogenic and autorhythmic.
