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?

Mr. Ahmadi was advised by his physician to lose weight and start jogging. He began to jog daily. On the sixth day, he was forced to jump out of the way of a speeding car. He heard a snapping sound that was immediately followed by pain in his right lower calf. A gap was visible between his swollen calf and his heel, and he was unable to plantar flex that foot. What do you think happened?

Susan full off her bicycle and fractured her right clavicle. Treatment prescribed by the emergency room physician included using a sling to immobilize the clavicle and speed its healing. What muscles are temporarily "out of business" as a result of this injury?

While jogging. Mr. Ahmadi was forced to jump out of the way of a speeding car. He heard a snapping sound that was immediately followed by pain in his right lower calf. A gap was visible between his swollen calf and his heel, and he was unable to Plantar flex that foot. What do you think happened?

Describe the events that occur from the time a motor neuron releases acetylcholine at the neuromuscular junction until muscle cell contraction occurs.

When a person dies, rigor mortis sets in as ATP synthesis ceases. Explain why the lack of ATP in muscle cells would cause the muscles to become rigid rather than limp soon after death.

Other than acting to flex the spine and compress the abdominal contents, the abdominal muscles are extremely important in protecting and containing the abdominal viscera. What is it about the arrangement of these muscles that makes them so well suited for their job?

If you compare electron micrographs of a relaxed skeletal muscle fiber and a fully contracted muscle fiber, which would you see only in the relaxed fiber? a. Z discs, b. Triads, c. I bands, d. A bands, e. H zones.

In general, what do we mean by a chemical bond? What does the bond energy tell us about the strength of a chemical bond? Name the principal types of chemical bonds.

Write the chemical formula for the following household chemical.

Aqueous sodium hydrogen sulfate (porcelain cleaner)

The coefficients of a balanced chemical equation tell you the relative number of moles of _____ and _____ in a chemical reaction.

If the chemical formula of compound A in previous question is SO$_{2}$, what is the chemical formula of compound B?

Identify Look at the two photographs of zinc nitrate, and the list of chemical grades. What grade is this chemical?

Give an example of a chemical reaction that occurs slowly. Give another example of a chemical reaction that occurs quickly.