*Question G0A01:
What is one way that RF energy can affect human body tissue?*  

*Correct Answer is  A: It heats body tissue*  

### AI Response: (may contain errors)  

The correct answer to the question is:

**A: It heats body tissue.**

### Explanation:

1. **Why the correct answer is correct:**
   - RF (radio frequency) energy can cause dielectric heating in body tissues. This occurs because RF energy is absorbed by the water molecules in the tissue, causing them to vibrate and generate heat. This is the principle behind microwave ovens, which use RF energy to heat food. In the context of human exposure, excessive RF energy can lead to thermal effects, which can raise the temperature of body tissues.

2. **Why the other choices are incorrect:**
   - **B: It causes radiation poisoning.**
     - RF energy is non-ionizing radiation, meaning it does not carry enough energy to ionize atoms or molecules or cause radiation poisoning. Ionizing radiation (like X-rays or gamma rays) is what can lead to radiation sickness.
   - **C: It causes the blood count to reach a dangerously low level.**
     - There is no direct evidence that RF energy affects blood counts in this manner. While excessive exposure can lead to thermal effects, it does not specifically lower blood counts.
   - **D: It cools body tissue.**
     - This is incorrect because RF energy does not cool body tissue; rather, it can increase the temperature of tissues through absorption and heating.

### Useful Concepts:
- **Specific Absorption Rate (SAR):** This is a measure of the rate at which RF energy is absorbed by the body, typically expressed in watts per kilogram (W/kg). It is important for assessing exposure limits to ensure safety.
- **Thermal Effects:** The primary concern with RF exposure is the potential for heating, which can lead to burns or other thermal injuries if the exposure is excessive.

Understanding these concepts will help you grasp the effects of RF energy on human tissue and prepare for related questions on the Extra Class exam.