The structural theory that explains how a muscle fiber contracts is called the ________ theory.
What will be an ideal response?
sliding-filament
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The muscularis layer in the wall of the digestive tract is
A. skeletal muscle throughout the tract, especially in the large intestine. B. composed of a layer of circular smooth muscle fibers and a layer of longitudinal smooth muscle fibers. C. the layer of the digestive tract wall that contains capillaries. D. connective tissue and the peritoneum. E. in direct contact with the food that is consumed.
An Olympic sprinter readies for a race. After the sound of the starting gun, she propels herself forward from the starting block and immediately grimaces in pain, grabbing for the back of her thigh. Within 48 hours she begins noticing extensive bruising on the back of her thigh extending into the back of the knee. She now has difficulty rising from a seated position and flexing her knee. Bending at the waist generates more pain. Which muscle is likely injured?
A. Gluteus maximus B. Biceps femoris C. Gastrocnemius D. Iliopsoas E. Popliteus
A substance that can stimulate a primary immune response but is unable to produce the symptoms of a disease is a(n) ________.
Fill in the blank(s) with the appropriate word(s).
Coronary artery disease can diminish myocardial blood flow resulting in the death of myocardial cells. This condition is known as a myocardial
A. attack. B. angina. C. necrosis. D. cirrhosis. E. infarction.