In humans, the life processes are controlled and regulated by

Options

A. reproductive and endocrine systems
B. respiratory and nervous systems
C. endocrine and digestive systems
D. nervous and endocrine systems

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the systems in humans that control and regulate life processes.

2. **Identifying Key Systems**: In humans, two main systems are responsible for control and coordination: the nervous system and the endocrine system.

3. **Role of the Nervous System**: The nervous system is composed of neurons that transmit signals throughout the body. It is responsible for quick responses to stimuli, coordinating activities such as movement and reflex actions.

4. **Role of the Endocrine System**: The endocrine system consists of glands that secrete hormones into the bloodstream. These hormones regulate various bodily functions, including growth, metabolism, and mood, and they work more slowly than the nervous system.

5. **Integration of Both Systems**: Both the nervous and endocrine systems work together to maintain homeostasis and ensure that all life processes are controlled and coordinated effectively.

6. **Evaluating Options**:
- Option 1 (Reproductive and Endocrine System): Incorrect, as the reproductive system is not primarily responsible for control.
- Option 2 (Respiratory System): Incorrect, as it is mainly involved in breathing and gas exchange.
- Option 3 (Endocrine and Digestive System): Incorrect, as the digestive system's primary role is digestion, not control.
- Option 4 (Nervous and Endocrine System): Correct, as these systems together manage control and coordination in humans.

7. **Conclusion**: The life processes in humans are controlled and regulated by the nervous system and the endocrine system.

**Final Answer**: The correct answer is option 4: Nervous and Endocrine System.

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