Which of the following best describes peristalsis?

• A. The absorption of nutrients through the intestinal wall
• B. A series of wave-like muscle contractions that move food through the digestive tract
• C. A process by which cells communicate using chemical messengers
• D. The breakdown of large molecules into smaller ones by enzymes

Answer: (B)

Verified step by step guidance

1. Understand the term 'peristalsis': Peristalsis refers to the involuntary, wave-like muscle contractions that occur in the walls of hollow organs, such as the digestive tract, to propel contents forward.
2. Eliminate incorrect options: Review each option and determine if it aligns with the definition of peristalsis. For example, 'absorption of nutrients' and 'breakdown of molecules by enzymes' are distinct processes in digestion but are not related to muscle contractions.
3. Focus on the correct description: Identify the option that specifically mentions 'wave-like muscle contractions' and their role in moving food through the digestive tract.
4. Relate to the digestive system: Recall that peristalsis occurs in organs like the esophagus, stomach, and intestines, helping to move food and waste along the digestive pathway.
5. Confirm understanding: Ensure that the chosen description accurately matches the biological process of peristalsis, distinguishing it from other digestive or cellular processes.