Final answer:
When sitting at the lunch table and eating a carrot, the organ systems involved are the digestive system, muscular and skeletal systems, circulatory system, and immune system.
Step-by-step explanation:
When sitting at the lunch table and eating a carrot, several organ systems are at work. These include the digestive system, which breaks down the carrot and absorbs the nutrients, and the muscular and skeletal systems, which allow you to hold and chew the carrot. The circulatory system helps transport the nutrients from the digested carrot to the rest of the body, while the immune system protects against any potential pathogens. The male reproductive system is not directly involved in the act of eating a carrot.