For each portion of a myogram tracing a twitch in a stimulated calf muscle fiber, describe the events that occur within the muscle fiber.

Chemical A binds and blocks acetylcholine receptors of muscle cells. Chemical B floods the cytoplasm of muscle cells with calcium ions. Which chemical would make the best muscle relaxant, and why?

What structural feature of a skeletal muscle fiber propagates action potentials into the interior of the cell?

What forms of energy reserves do resting skeletal muscle fibers contain?

Areas of the body where you would not expect to find slow fibers include the (a) back and calf muscles, (b) eye and hand, (c) chest and abdomen, (d) all of these.

Characteristics of isometric contractions include all buta. shortening,b. increased muscle tension throughout the contraction phase,c. absence of shortening,d. used in resistance training.

When a suicide victim was found, the coroner was unable to remove the drug vial clutched in his hand. Explain the reasons for this. If the victim had been discovered three days later, would the coroner have had the same difficulty? Explain.

Define neuromuscular junction, motor unit, tetanus, graded response, aerobic respiration, anaerobic glycolysis, muscle fatigue, and neurotransmitter.

When Eric returned from jogging, he was breathing heavily and sweating profusely, and he complained that his legs ached and felt weak. On the basis of what you have learned about muscle energy metabolism, respond to the following questions:a.Why is Eric breathing heavily?