The rhythmic contraction and relaxation waves propelling semi-digested food through the alimentary canal are termed ______ movement
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Answer: C. Peristaltic
Explanation
Peristalsis involves a series of radially symmetric wave-like muscle contractions moving along tubular organs. These rhythmic contractions push semi-digested food forward through the entire gastrointestinal alimentary canal. Smooth muscles in the digestive tract walls coordinate this involuntary movement to aid digestion. The alimentary canal is a continuous muscular passage extending from the mouth down to the anus. Smooth muscle tissue operates involuntarily under the control of the autonomic nervous system. Digestion requires mechanical breakdown alongside enzymatic processing to absorb essential nutrients effectively.
Medical professionals study peristaltic dysfunction when diagnosing various gastrointestinal motility disorders in patients. Swallowing food upside down remains possible due to the powerful muscular action of esophageal peristalsis. Pharmacological treatments can stimulate or inhibit these digestive muscle waves to manage specific conditions. Option A relates strictly to stomach secretions and functions rather than wave-like propulsion mechanisms. Option B describes the relaxation phase of the cardiac cycle when heart chambers fill with blood. Option D refers to general back and forth vibration rather than directed muscular food transport.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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