Peristaltic waves are:

• A. the diffusion of solutes from high to low concentration
• B. the movement of water across a semipermeable membrane
• C. waves of muscular contractions that move contents through a tubular organ
• D. electrical impulses that travel along nerve fibers

Answer: (C)

Verified step by step guidance

1. Understand the term 'peristaltic waves': Peristalsis refers to the rhythmic, wave-like muscular contractions that occur in tubular organs, such as the esophagus, stomach, and intestines, to propel contents forward.
2. Identify the key anatomical structures involved: Peristaltic waves are generated by the smooth muscle layers in the walls of tubular organs. These muscles contract and relax in a coordinated manner to create the wave-like motion.
3. Differentiate peristalsis from other physiological processes: Peristalsis is distinct from diffusion (movement of solutes from high to low concentration) and osmosis (movement of water across a semipermeable membrane). It is a mechanical process driven by muscle contractions, not passive transport.
4. Relate peristalsis to its function: The primary purpose of peristaltic waves is to move food, waste, or other contents through the digestive tract or other tubular systems in the body, ensuring proper digestion and excretion.
5. Connect peristalsis to nervous system control: Peristaltic waves are regulated by the enteric nervous system, which coordinates the contraction and relaxation of smooth muscles in response to stimuli, ensuring efficient movement of contents.