Question:
Assertion (A): Reduced blood supply to heart muscles causes ischemia which results in chest pain.
Reason (R): It is a warning signal of deprivation of blood supply to heart muscles.
Assertion (A): Reduced blood supply to heart muscles causes ischemia which results in chest pain.
Reason (R): It is a warning signal of deprivation of blood supply to heart muscles.
Reason (R): It is a warning signal of deprivation of blood supply to heart muscles.
Show Hint
Ischemia means "restricted blood flow" which leads to hypoxia (lack of oxygen).
Remember, Angina Pectoris is acute chest pain that occurs when not enough oxygen reaches the heart muscle.
Remember, Angina Pectoris is acute chest pain that occurs when not enough oxygen reaches the heart muscle.
Updated On: Jul 22, 2026
- Both (A) and (R) are true. (R) is correct explanation for (A)
- Both (A) and (R) are true. (R) is not correct explanation for (A)
- (A) is true. But (R) is false
- (A) is false. But (R) is true
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Question:
We need to analyze the physiological link between a reduced oxygen/blood supply to cardiac muscles (ischemia), the resulting chest pain (angina pectoris), and its function as a warning signal.
Step 2: Key Concept and Approach:
When coronary blood flow is compromised, oxygen supply to cardiac muscles falls below demand, causing ischemia.
Ischemic cells release chemical distress signals (like adenosine, bradykinin, and protons) that stimulate local pain-sensing nerve fibers.
We will evaluate both statements and determine if the reason properly explains why ischemia results in painful sensations.
Step 3: Detailed Explanation:
• Myocardial Ischemia and Pain: Assertion (A) is true.
A reduction in coronary blood supply leads to myocardial hypoxia.
Anaerobic metabolism produces lactic acid, stimulating sensory nerves and resulting in chest pain known as Angina Pectoris.
• Role of Pain as a Warning: Reason (R) is true.
This ischemic pain serves as a protective physiological warning mechanism.
It alerts the individual to reduce physical exertion, preventing irreversible tissue death (myocardial infarction).
• Logical Connection: The occurrence of pain is a direct warning sign of the underlying oxygen deprivation.
Therefore, Reason (R) is the correct explanation for Assertion (A).
Step 4: Final Answer:
Both (A) and (R) are true, and (R) is the correct explanation for (A).
We need to analyze the physiological link between a reduced oxygen/blood supply to cardiac muscles (ischemia), the resulting chest pain (angina pectoris), and its function as a warning signal.
Step 2: Key Concept and Approach:
When coronary blood flow is compromised, oxygen supply to cardiac muscles falls below demand, causing ischemia.
Ischemic cells release chemical distress signals (like adenosine, bradykinin, and protons) that stimulate local pain-sensing nerve fibers.
We will evaluate both statements and determine if the reason properly explains why ischemia results in painful sensations.
Step 3: Detailed Explanation:
• Myocardial Ischemia and Pain: Assertion (A) is true.
A reduction in coronary blood supply leads to myocardial hypoxia.
Anaerobic metabolism produces lactic acid, stimulating sensory nerves and resulting in chest pain known as Angina Pectoris.
• Role of Pain as a Warning: Reason (R) is true.
This ischemic pain serves as a protective physiological warning mechanism.
It alerts the individual to reduce physical exertion, preventing irreversible tissue death (myocardial infarction).
• Logical Connection: The occurrence of pain is a direct warning sign of the underlying oxygen deprivation.
Therefore, Reason (R) is the correct explanation for Assertion (A).
Step 4: Final Answer:
Both (A) and (R) are true, and (R) is the correct explanation for (A).
Was this answer helpful?
0
0
Top AP EAPCET Zoology Questions
- The incorrect statement for subspecies
- The equation which explains relation of species–area on logarithmic scale
- Life span of blood platelets is
- Assertion (A): The activated osteoblasts start deposition of mineral material to join fractured bone.
Reason (R): The major part of inorganic matter of bone is collagen. - Choose the correct statement among the following
View More Questions
Top AP EAPCET Cardiovascular system Questions
- Sino-Atrial Node (SAN) is situated in
Match the column I with Column II.
- Assertion (A): Angina pectoris occurs due to transient myocardial ischemia without causing permanent damage to heart muscles. Reason (R): In coronary artery disease, narrowing of coronary arteries reduces blood supply to myocardium.
Top AP EAPCET Questions
- A body is projected from the ground at an angle of $\tan^{-1} \left( \frac{8}{7}\right)$ with the horizontal. The ratio of the maximum height attained by it to its range is
- The four quantum numbers of the valence electron of potassium are :
- A lens forms real and virtual images of an object, when the object is at $u_{1}$ and $u_{2}$ distances respectively. If the size of the virtual image is double that of the real image, then the focal length of the lens is (take, the magnification of the real image as $m$ )
- Two spheres $P$ and $Q$, each of mass $200\, g$ are attached to a string of length one metre as shown in the figure. The string and the spheres are then whirled in a horizontal circle about $O$ at a constant angular speed. The ratio of the tension in the string between $P$ and $Q$ to that of between $P$ and $O$ is $(P$ is at mid-point of the line joining $O$ and $Q$ )
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
View More Questions