Question

Match the following

Column-I	Column-II
a. Beginning of oesphagus	(i) skeletal muscle
b. Posterior end of oesophagus	(ii) cardiac muscle
c. Heart	(iii) smooth muscle

• A. a(i), b(iii)., c(ii)
• B. a(i), b(ii), c(iii_
• C. a(ii), b(iii), c(i)
• D. a(iii), b(i), c(ii)

Answer 1

The correct option is A a(i), b(iii)., c(ii)

1. The upper esophageal sphincter (UES) is a bundle of muscles at the top of the esophagus. The muscles of the UES are voluntary (skeletal) used when breathing, eating, belching, and vomiting. They keep food and secretions from going down the windpipe.

2. The lower esophageal sphincter (LES) is a bundle of muscles at the low end of the esophagus, where it meets the stomach. When the LES is closed, it prevents acid and stomach contents from traveling backwards from the stomach. The LES muscles are not under voluntary control (smooth).

3. Cardiac muscles are involuntary, striated muscle that constitutes the main tissue of the walls of the heart.

So, the correct option is 'a(i), b(iii), c(ii)'