Question

​a strain or tear on any of the muscles that straighten the hip and bend the knee is known as a/an _____.

Answer 1

It's a hamstring injury. The hamstrings are the three posterior thigh muscles: semimembranosus, semitendinosus and biceps femoris. All three of them cross the hip and the knee joint and because of it, they help with the knee flexion and hip extension (straightening). 

Answer 2

Answer:

Hamstring injury

Explanation:

A Hamstring injury occurs when one or more of your hamstring muscles is strained or pulled. They are consist of three muscles that run along the back of your thigh.