Home
Class 12
BIOLOGY
What would happen if there is failure of...

What would happen if there is failure of receiving the atrial impulse by the ventricles or completely independent contraction of the atria and the ventricles ?
A - Ventricular escape
B - Stokes - Adams syndrome
C - Irregularity in heart rhythm
D - Arteriosclerosis

A

A only

B

A and B

C

A,B and C

D

A, B,C and D

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the consequences of the failure of receiving the atrial impulse by the ventricles or the independent contraction of the atria and ventricles, we will analyze each option provided in the question. ### Step-by-Step Solution: 1. **Understanding the Problem**: - The question asks what happens when the atrial impulses do not reach the ventricles, leading to independent contractions of the atria and ventricles. This situation can cause various cardiac conditions. 2. **Analyzing Option A - Ventricular Escape**: - Ventricular escape occurs when the atrial impulses are not conducted to the ventricles, leading to the ventricles relying on their intrinsic pacemaker for rhythm. This can happen when the atrioventricular (AV) node fails to transmit impulses. - **Conclusion**: This option is relevant to the scenario described. 3. **Analyzing Option B - Stokes-Adams Syndrome**: - Stokes-Adams syndrome is characterized by sudden fainting or loss of consciousness due to a significant drop in heart rate or irregular heart rhythms. This can occur when the atria and ventricles are not coordinating properly. - **Conclusion**: This option is also relevant to the scenario described. 4. **Analyzing Option C - Irregularity in Heart Rhythm**: - Irregularity in heart rhythm, or arrhythmia, can occur when the electrical impulses that regulate the heartbeat are not functioning correctly. This can happen if the atria and ventricles are contracting independently. - **Conclusion**: This option is relevant as well. 5. **Analyzing Option D - Arteriosclerosis**: - Arteriosclerosis refers to the thickening and hardening of arterial walls, often due to factors like high blood pressure or cholesterol. It is not directly related to the failure of atrial impulses reaching the ventricles. - **Conclusion**: This option is not relevant to the scenario described. 6. **Final Conclusion**: - Options A, B, and C are all consequences of the failure of atrial impulses reaching the ventricles or independent contractions. However, the most direct consequence of this failure is irregularity in heart rhythm, which is option C. ### Answer: **C - Irregularity in heart rhythm**
Promotional Banner

Similar Questions

Explore conceptually related problems

mark the true and false statements a. SAN generates as action potential which stimulates atrial systole. b. ECG is an electrical representation of the graphical activity of the heart during a cardiac cycle. c. The cardiac output of a normal man will be much lesser than an athlete. d. The wall of right ventricle is much thicker than the left ventricle e. In pisces the two separate circulatory pathways are present, hence they have double circulation. f. The clsoed circulatory pattern is considered to be more advantageous than open circulatory pattern. g. Glucose is absorbed by simple diffusion through lymph in lacteales present in the intestinal villi. h. The SAN can generate the maximum number of action potential i.e. 140-150 mi n^(-1) in neonates, and is responsible for initiation and maintenance of the rhythmic contractile activity of the heart. i. Angina can occur in any age but more common among the neonates and infants. j. heart failure is sometimes called congestive heart failure because congestion of the blood vessels is one of the main symptoms of this disease.

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 ______

Which of the following events do not occur during joint diastole ? (A) All four chamber of heart are in relaxed state (B) Atrial repolarization valve open (C ) Action potential is conducted from SAN to AVN (D) Blood from the pulmonary veins and vena cava flows into the left and right ventricles respectively through the left and right atria (E ) The semilunar valves are closed