Home
Class 12
BIOLOGY
A : Endocardium provides a smooth lining...

A : Endocardium provides a smooth lining for the inside of the heart and covers the valves of the heart.
R : Endocardium is continuous with the endothelial lining of the large blood vessels associated with the heart and the rest of the cardiovascular system.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).

C

If Assertion is true statement but Reason is false, then mark (3).

D

If both Assertion and Reason are false statements, then mark (4).

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion and reason question, we will analyze both statements step by step. ### Step 1: Analyze the Assertion The assertion states: "Endocardium provides a smooth lining for the inside of the heart and covers the valves of the heart." - The endocardium is indeed the innermost layer of the heart. - It serves to provide a smooth surface that reduces friction as blood flows through the heart chambers and over the heart valves. - Therefore, this assertion is **true**. ### Step 2: Analyze the Reason The reason states: "Endocardium is continuous with the endothelial lining of the large blood vessels associated with the heart and the rest of the cardiovascular system." - The endocardium is made up of cells that are similar to endothelial cells, which line the blood vessels. - It is correct that the endocardium is continuous with the endothelial lining, meaning that it connects seamlessly with the blood vessels. - Thus, this reason is also **true**. ### Step 3: Determine the Relationship Between Assertion and Reason Now we need to determine if the reason correctly explains the assertion. - The assertion talks about the function of the endocardium in providing a smooth lining and covering the heart valves. - The reason discusses the continuity of the endocardium with the endothelial lining of blood vessels. - While both statements are true, the reason does not directly explain why the endocardium provides a smooth lining or its role in covering the valves. ### Conclusion Both the assertion and reason are true, but the reason does not serve as the correct explanation for the assertion. Therefore, the correct answer is that both are true, but the reason is not the correct explanation of the assertion. ### Final Answer The correct option is: **Both assertion and reason are true, but the reason is not the correct explanation of the assertion.** ---
Promotional Banner

Topper's Solved these Questions

  • BODY FLUIDS AND CIRCULATION

    AAKASH INSTITUTE ENGLISH|Exercise Assignment Section - C Previous Year Questions|69 Videos

  • BIOTECHNOLOGY-PRINCIPLES AND PROCESSES

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION-D (Assertion-Reason Type Question)|10 Videos

  • BREATHING AND EXCHANGE OF GASES

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION - D|11 Videos

Similar Questions

Explore conceptually related problems

Explain the location and functions of various valves present in the heart and blood vessels.

The human ciculatory system can be thought of as a closed system of interconnecting pipes through which fluid is continuously circulated by two pumps the two pumps the right and left verticles of the heart, work as simple two-stroke force pumps. The muscles of the heart regulate the force by contracting and relaxing. the contraction (systole) lasts about 0.2s and a complete systole/diastole (contraction/relaxation) cycle lasts about 0.8s. For flood pressures and speeds in the normal range. the volume flow rate of blood through a blood vessel is directly proportional tot he pressure difference over a length of the vessel and to the fourth power of the radius of the vessel. The total mechanical energy per unit volume of blood just as it leaves the heart is E//V=rhogh+P+rhov^(2) Q. Why is diastolic blood pressure muchh lower than systolic pressure? A. because the heart exerts more force on the blood during diastole B. Because the heart exerts no force on the blood during diastole C. Because the radii of the blood vessels increase during diastole while the force exerted by the heart on the blood remains the same. D. Because the radii of the blood vessels increase during diastole while the force exerted by the heart on the blood remains the same.

Given below the simplified pathway of the circulatory system of man: Name the blood vessel that supplies the walls of the heart with oxygen.

a. Amphibians and reptiles have a 3 chambered heart with ___ atria and ___ventricle. b. Heart is ___ derived organ and protected by a double walled membranous bag called ____ c. The opening between right Atrium and Right ventricle is guarded by a valve formed of ___ muscular flaps, the ___ valve. d. The wall of ventricle is ____ than atria. e. SAN can generate the maximum number of action potential i.e., ____ mi n^(-1) . therefore it is called _____ f. Atrial systole increases the flow of blood into the ventricles by about ____ percent. g. In ____ all the four chambers of the heart are in a relax state. h. The ____ wave represents the depolarisation of the atria. i. A system of blood vessels is present in our body exclusively for the circulation of blood to and from the cardiac musculature called _____ j. PNA ____ the rate of heart beat and ______