Of the total amount of saliva secreted by all the salivary glands, about 60% is secreted by the
**Core Concept**
The human salivary system consists of three major pairs of salivary glands: the parotid, submandibular, and sublingual glands, along with numerous minor salivary glands. Each gland has distinct functions and contributes to the overall volume of saliva produced.
**Why the Correct Answer is Right**
The submandibular gland is responsible for producing a significant portion of the total saliva secreted. It secretes a mixture of serous and mucinous secretions, with the serous component being the primary contributor to the total volume of saliva. The submandibular gland's secretions are rich in enzymes such as amylase, which aids in carbohydrate digestion. The high volume of saliva secreted by the submandibular gland helps to maintain oral homeostasis and facilitates swallowing.
**Why Each Wrong Option is Incorrect**
**Option A:** The parotid gland primarily secretes serous secretions, but its contribution to the total volume of saliva is significantly less than that of the submandibular gland.
**Option B:** The sublingual gland secretes mostly mucinous secretions, which contribute to the lubrication of food but do not make up the majority of the total saliva volume.
**Option C:** The minor salivary glands, although numerous, contribute a relatively small percentage of the total saliva secreted compared to the major salivary glands.
**Clinical Pearl / High-Yield Fact**
The submandibular gland's secretions are more alkaline than those of the parotid gland, which helps to neutralize acidic food particles and maintain oral pH homeostasis.
**Correct Answer: C. The sublingual gland.**