The effects of the sound wave upon the biologic tissue through which it passes are called

• A. Acoustic propagation properties
• B. Biologic effects
• C. Thermal effects
• D. Electrical effects

Answer: (B)

The main idea here is the term used for what ultrasound energy does to tissue as it travels through it. That overall impact on living tissue is called biologic effects. This label covers all ways the tissue can respond to the energy, including any heating (thermal effects) and mechanical interactions like microstreaming or cavitation. The other options describe aspects of the wave itself or its energy transfer—acoustic propagation properties refer to how the wave travels (speed, attenuation, impedance), thermal effects refer specifically to temperature rise, and electrical effects pertain to the transducer’s energy, not the tissue response. So the best term for the tissue response to the sound wave is biologic effects.