4. heartburn is caused by
a. seepage of gastric acid into the esophagus.
b. seepage of gastric acid into the cardiac muscle.
c. seepage of bile into the stomach.
d. seepage of salivary amylase into the stomach.

The answer is A.

Explanation:

Heartburn happens because stomach acid becomes backed up in the esophagus, which moves food from your mouth to your stomach.

The burning sensation is usually the result of stomach acid leaking up into the esophagus through a flaw in a valve known as the lower esophageal sphincter (LES), which connects the esophagus and the stomach. When the LES doesn't tighten properly or becomes weakened, stomach acid can flow back into the esophagus, causing a burning feeling.

c. spiritual heath is subjective.

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