Dr. O eventually succumbs to the toxic effect of curare and dies. 12 hours later, two of Dr. O's anatomy and physiology students find his corpse, which is now stiff as a rock. Recalling their lecture on the muscular system, the students exclaim, "Dr. O is experiencing rigor mortis, also known as postmortem rigidity!" The students then discuss the mechanism of rigor mortis which involves:

How long would it take for proteins to degrade in rigor mortis, allowing for relaxation of the affected muscles?

A large quantity of ACh in the neuromuscular junction would result in

John Doe, a 45-year-old farmer, presented to the emergency department with a chief complaint of muscle spasticity, nausea, vomiting, and difficulty breathing. He reported that the symptoms had started approximately 6 hours after he was spraying his crops with pesticides. He described the pesticides he had used as acetylcholinesterase inhibitors and admitted to accidental exposure due to inadequate personal protective equipment. What is happening at the neuromuscular junction? Select all that apply

Emma, a 6-month-old female, was brought to the emergency department by her parents with a chief complaint of weakness, poor feeding, and difficulty breathing. Her parents reported that these symptoms had progressively worsened over the past few days. Emma was a previously healthy infant who had been exclusively breastfed, but they had recently introduced small amounts of honey into her diet. As it turns out, the honey was contaminated with Clostridium botulinum. What is the underlying mechanism of botulinum toxicity?

Sarah, a 35-year-old woman, presented with a history of progressive muscle weakness, which had developed over several months. She described experiencing difficulty in keeping her eyes open and swallowing, and her symptoms typically worsened as the day progressed. Physical examination revealed: Bilateral ptosis (drooping eyelids). Muscle weakness in the limbs, notably the proximal muscles. Facial muscle weakness leading to a "mask-like" expression. Reduced ability to swallow. What is this patient's diagnosis?

Myasthenia gravis is an autoimmune disorder that involves:

Motor units attach to muscle fibers at the ___

Muscles that require precise movement have ___ motor units and muscles that require powerful movements have ___ motor units

More motor units results in a stronger muscle contraction. True or false?

Sustained muscle contractions require few action potentials. True or false?

During the latent period of muscle tension production,

During muscle tension production, treppe can be best described as:

During muscle tension production, fused or complete tetanus can be best described as: