Question

The following are the physiological effects of Ultrasonic therapy:
A. Improved extensibility of the collagen
B. Heating of the tissues
C. Cooling of the tissues due to microstreaming
D. Unidirectional movement of fluids along the boundaries of the cell
E. Providing low and medium frequency current
Choose the correct answer from the options given below:

• A. B and E Only
• B. A and C Only
• C. A, B and E Only
• D. A, B and D Only

Hint:

Ultrasound = Thermal (heating) + Non-thermal (microstreaming)

Answer 1

The Correct Option is D

Concept:
Ultrasound therapy produces both thermal and non-thermal physiological effects on tissues.

Step 1: Thermal effects.

• Ultrasound causes deep heating
• Increases tissue temperature Thus: \[ B: Heating of tissues (Correct) \]

Step 2: Collagen extensibility.

• Heating increases flexibility of collagen tissues Thus: \[ A: Improved extensibility (Correct) \]

Step 3: Non-thermal effects.

• Acoustic streaming causes fluid movement near cell membranes Thus: \[ D: Unidirectional fluid movement (Correct) \]

Step 4: Incorrect options.

• C: Cooling does not occur; ultrasound produces heating
• E: Ultrasound is mechanical wave, not electrical current

Step 5: Final conclusion.
\[ \boxed{\text{Correct answer = Option (4)}} \]