Final answer:
Hyperechoic tissue is the term for tissue that lights up white and gray on ultrasound.
Step-by-step explanation:
The term for tissue that lights up white and grey on ultrasound is hyperechoic tissue (option b).
Hyperechoic tissue refers to tissue that reflects more sound waves back to the ultrasound probe, resulting in a brighter appearance on the ultrasound image. This type of tissue appears white or light gray on the image.
For example, bone tissue and tendons are typically hyperechoic, while fluid-filled structures like cysts or blood vessels may appear dark or anechoic on ultrasound images.