A runner who has increased her training regimen dramatically in preparation for a marathon has begun to experience tingling and numbness down the rear of her right leg and into her right foot. What is the cause of these problems?
What will be an ideal response?
The condition the runner is experiencing is sciatica, or irritation of the sciatic nerve, which may be caused by tightening of the hamstring group of muscles that surround the nerve. Additional stretching may alleviate some of the muscle tightness, but typically the runner would need to reduce her exercise for a period of time to let the nerve recover.
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Most muscles that move the thigh originate on the
A. iliotibial tract. B. os coxae. C. sacral spine. D. linea alba. E. head of the femur.
Edema is
A) a response to dehydration. B) abnormal accumulation of extracellular fluid. C) caused by depressed venous pressure. D) caused by hyperproteinemia.
Place the following events in the correct sequence in which they occur: excitation-contraction coupling, electrical excitation of the muscle cell membrane, sliding of the myofilaments
A) excitation-contraction coupling, sliding of myofilaments, electrical excitation of the muscle cell membrane B) sliding of the myofilaments, electrical excitation of the muscle cell membrane, excitation-contraction coupling C) electrical excitation of the muscle cell membrane, sliding of the myofilaments, excitation-contraction coupling D) electrical excitation of the muscle cell membrane, excitation-contraction coupling, sliding of the myofilaments
Sarcoplasm is the
A. cytoplasm of a muscle fiber. B. contractile thread that extends the length of the muscle fiber. C. plasma membrane of a muscle fiber. D. protein strand composed of actin or myosin. E. structural and functional unit of the skeletal muscle fiber.