Answer: Food through the digestive tract by rhythmic muscle contractions.
- A Blood pumped through arteries by cardiac muscle contraction
- B Food through the digestive tract by rhythmic muscle contractions
- C Air drawn through bronchi by diaphragm contraction
- D Lymph propelled through vessels by one-way valves
Correct answer: B. Food through the digestive tract by rhythmic muscle contractions
Explanation: Peristalsis: coordinated, rhythmic smooth muscle contractions that propel food through the gastrointestinal tract.
The human digestive system. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
The digestive tract, digestive enzymes, hormonal control of digestion, and liver function. High NEET weightage.