Painkillers, specifically narcotics, can cause constipation. A lot of receptors for the narcotic class of drugs are in the digestive tract, so it tends to bring everything to a halt, says Thomas Park, MD, a gastroenterologist with the University of Rochester Medical Center Park in New York.
Full Muscles of the Leg and Foot Description. [Continued from above] . . . The anterior muscles, such as the quadriceps femoris, iliopsoas, and sartorius, work as a group to flex the thigh at the hip and extend the leg at the knee.Posterior muscles, such as the hamstrings and gluteus maximus, produce the opposite motion â extension of the thigh at the hip and flexion of the leg at the knee.Continued from above] . . . The anterior muscles, such as the quadriceps femoris, iliopsoas, and sartorius, work as a group to flex the thigh at the hip and extend the leg at the knee.
When you perform leg extensions, you contract the quad to bring your knees up against the weighted resistance. While many other exercises such as squats, lunges or deadlifts also provide a heavy workout for the quads, they do not isolate the muscle like a leg extension does. Any exercise that requires you to contract your quadriceps against resistance can accomplish the same effect as a leg extension machine.