Home
Class 12
BIOLOGY
A : First phase of ventricular filling i...

A : First phase of ventricular filling is rapid and causes `3^(rd)` sound of heart.
R : It is because of auricular systole.

A

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

B

If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.

C

If Assertion is true, but Reason is false.

D

If both Assertion and Reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that the first phase of ventricular filling is rapid and causes the third heart sound. - This is true. The first phase of ventricular filling occurs during diastole when blood flows rapidly from the atria into the ventricles. This rapid inflow of blood is indeed associated with the third heart sound (S3). 2. **Understanding the Reason**: - The reason provided states that this rapid filling is due to auricular systole. - This is false. Auricular systole refers to the contraction of the atria, which occurs after the rapid filling phase. The rapid filling phase is primarily due to the pressure difference between the atria and ventricles, allowing blood to flow into the ventricles when they are relaxed. 3. **Conclusion**: - Since the assertion is true (the first phase of ventricular filling is rapid and causes the third heart sound), but the reason is false (it is not due to auricular systole), we conclude that the assertion is true while the reason is false. ### Final Answer: - The assertion is true, and the reason is false.
Promotional Banner

Topper's Solved these Questions

  • BODY FLUIDS AND CIRCULATIONS

    CENGAGE BIOLOGY ENGLISH|Exercise ARCHIVES (Choose the correct option)|30 Videos

  • BODY FLUIDS AND CIRCULATIONS

    CENGAGE BIOLOGY ENGLISH|Exercise ARCHIVES (Choose the correct option)|30 Videos

  • BIOTECHNOLOGY:PRINCIPLES AND PROCESSES

    CENGAGE BIOLOGY ENGLISH|Exercise ARCHIVES (Choose the correct option)|33 Videos

  • ECOSYSTEM

    CENGAGE BIOLOGY ENGLISH|Exercise ARCHIVES (CHOOSE THE CORRECT OPTION)|41 Videos

Similar Questions

Explore conceptually related problems

A : Dub is a long and sharp sound. R : It is caused by closing of atrio ventricular valves.

The "lubb" sound (first heart sound) is caused by

Read the given statements and select the correct option w.r.t. true and false : br (a) Duration of each cardiac cycle is 0.8 seconds which can be altered in fear or fight conditions, br (b) Rapid passive ventricular filling takes place when auricles are in diastole and auriculoventricular valves remain closed, br (c) Semilunar valves open when intraventricular pressure exceeds the pressure within aorta, br (d) Sinoatrial node comprises of autoexcitable tissue.

Differentiate between the following pairs on the basis of what is given in brackets: Beginning of the ventricular systole and the end of ventricular systole. (type of heart sound)

Assertion : First heart sound (LUBB) is produced at the beginning of ventricular systole stage. Reason : During ventricular systole semilunar valves are closed.

Rise in ventricular pressure during ventricular systole leads to closure of atrioventricular valves which generates 1) Lub sound 2) Dub sound 3) Third heart sound 4) Heart murmurs

Which of the following statement is CORRECT ? I. Heart, the mesodermally derived organ, is situated in the thoracic cavity, in between the two lungs , slightly tilted to the left. II. During joint diastole , tricuspid and bicuspid valves are open and the semilunar values are closed. III. The first heart sound (lub) is associated with the closure of the tricuspid and biscuspid valves whereas the second heart sound (dub) is associated with the closure of the semilunar valves . IV. Neural signals through the sympathetic nerves can increases the rate of hearbeat, the strength of ventricular contraction and thereby the cardiac output.

Read the following statements and select the correct option. A. Damage to chordae tendinae of semilunar valves in aorta causes back flow of blood in left ventricle. B. Closure of atrio-ventricular valves during ventricular systole generates first heart sound.

Which of the following is mismatched w.r.t its duration? (a) Atrial systole : 0.1 secs (b) Atrial diastole : 0.5 secs (c) Ventricular systole : 0.3 secs (d) Joint diastole : 0.4 secs

When a sound wave enters the ear, it sets the eardrum into oscillation, which in turn causes oscillation of 3 tiny bones in the middle ear called ossicles. This oscillation is finally transmitted to the fluid filled in inner portion of the ear termed as inner ear, the motion of the fluid disturbs hair cells within the inner ear which transmit nerve impulses to the brain with the information that a sound is present. The theree bones present in the middle ear are named as hammer, anvil and stirrup. Out of these the stirrup is the smallest one and this only connects the middle ear to inner ear as shown in the figure below. The area of stirrup and its extent of connection with the inner ear limits the sensitivity of the human ear consider a person's ear whose moving part of the eardrum has an area of about 50mm^2 and the area of stirrup is about 5mm^2 . The mass of ossicles is negligible. As a result, force exerted by sound wave in air on eardum and ossicles is same as the force exerted by ossicles on the inner ear. Consider a sound wave having maximum pressure fluctuation of 4xx10^-2Pa from its normal equilibrium pressure value which is equal to 10^5Pa . Frequency of sound wave in air is 332(m)/(s) . Velocity of sound wave in fluid (present in inner ear) is 1500(m)/(s) . Bulk modulus of air is 1.42xx10^5Pa . Bulk modulus of fluid is 2.18xx10^9Pa . Q. This person (without hearing aid machine) is sitting inside a busy restaurant where average sound intensity is 3.2xx10^-5(W)/(m^2) . How much energy in the form of sound is taken up by the person in his meal time of 1 h?