Home
Class 12
BIOLOGY
Assertion : Angina pectoris means ''pain...

Assertion : Angina pectoris means ''pain in the chest''.
Reason : It results due to carrying of extra blood to the heart muscle.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
C
Angina pectoris literally means "pain in the chest". It results from arteriosclerosis of the arteries that supply the heart muscle itself, i.e., the coronary arteries. Arteriosclerosis is the hardening A of arteries and arterioles due to thickening of the fibrous tissue, and the consequent loss of elasticity.
Due to the lack of required expansion, the arteries are unable to carry extra blood to the heart muscle at the time of stress when the heart is beating more vigorously. Deprived of oxygen the heart muscle experiences constricting pain.
Promotional Banner

Similar Questions

Explore conceptually related problems

Assertion: In cockroach, inspiration is an active process. Reason: It is due to the contraction of tergosternal muscle.

Assertion : The heart of fish contains only deoxygenated blood. Reasoning : Oxygenated blood does not return back to the heart in fishes.

Assertion : Adrenaline is called a emergency hormone. Reason : It acts on the cells of skeletal, cardiac, smooth muscles, blood Reason vessels and fat cells.

Assertion : Left atrium has the thickest muscles Reason : Right atrium receive blood from the lungs

Assertion: Tetany is rapid spasm in muscle. Reason: Tetany is usually caused by an increases in the blood calcium level.

Assertion: sinus venosus is a thin-walled sac with little muscular tissue in primitive heart. Reason: It receives venous blood through the hepatic veins.

Assertion :- Gynaecomastia is observed in Turner's syndrome. reason :- Such a disorder is caused due to the presence of extra copy of X-chromosome.

Assertion (A): wedge_(m(H^(o+))) and wedge_(m(overset(c)(O)H)) ions are very much higher than those of other ions. Reason (R): It is due to proton jump from one water molecule to another resulting in a more rapid transfer of positive charge form one region to another. (a)If both (A) and (R) are correct, and (R) is the correct explanation of (A) . (b)If both (A) and (R) are correct, but (R) is not the correct explanation of (A) . (c)If (A) is correct, but (R) is incorrect. (d)If (A) is incorrect, (R) is correct.

In which disease a symptom of acute chest pain appears when no enough oxygen is reaching the heart muscles?

Assertion : There is no mixing of oxygenated and deoxygenated blood in the human heart. Reason : Valves are present in the heart which allows the movement of blood in one direction only.