Massachusetts Comprehensive Assessment System (MCAS) Biology Practice Test

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Prepare for the MCAS Biology Exam with our quiz. Study with flashcards and multiple choice questions, each with helpful hints and explanations. Excel in your exam!

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What is the primary function of the esophagus in the digestive system?

To break down food into molecules
To push food towards the stomach
To absorb nutrients from food
To store food temporarily

The correct answer is: To push food towards the stomach

The primary function of the esophagus in the digestive system is to push food towards the stomach. This muscular tube connects the throat (pharynx) to the stomach and serves as the pathway through which food travels after being swallowed. The process is facilitated by rhythmic contractions known as peristalsis, which move the food along the esophagus and prevent it from reversing direction. The esophagus itself does not engage in the breakdown of food into smaller molecules or absorb nutrients, as these functions are primarily carried out in other parts of the digestive system, such as the stomach and intestines. It also does not serve as a storage site for food; instead, it acts mainly as a conduit, ensuring that food reaches the stomach efficiently for further digestion.