Question

question 7
cardiac and smooth muscle tissue contract involuntarily. which of the following is an involuntary process done by sm
hiding your breath
elimination of solid waste from the large intestine
swallowing your food
movement of food through the small intestine

Explanation:

1. Analyze each option:

• Holding your breath: This is a voluntary action as you can control it consciously.
• Elimination of solid waste from the large intestine: While defecation can have involuntary aspects, the process of elimination from the large intestine (like the movement of feces to the rectum) is part of peristalsis, but the final elimination (defecation) can be under voluntary control to some extent (when you choose to go to the bathroom). However, the main involuntary muscle action here is still part of the process, but let's check other options.
• Swallowing your food: The initial part of swallowing (oral phase) is voluntary, but the pharyngeal and esophageal phases are involuntary. However, the question is about smooth muscle. Swallowing involves skeletal muscle (in the oral phase) and smooth muscle (in the esophageal phase), but let's check the last option.
• Movement of food through the small intestine: This is done by peristalsis, which is an involuntary process carried out by smooth muscle. The smooth muscle in the small intestine contracts involuntarily to move food along, and this is a purely involuntary process with smooth muscle action.

1. Conclusion: The movement of food through the small intestine is an involuntary process done by smooth muscle.

Answer:

The correct option is: movement of food through the small intestine (the option with "movement of food through the small intestine" text, assuming the option is labeled appropriately, for example, if it's option D: D. movement of food through the small intestine)