During muscle contraction, what happens to the sarcomere?

Case Study: Scenario: An athlete complains of sudden onset calf pain during a sprint. They describe a popping sensation followed by intense pain and difficulty walking. Upon examination, there is visible swelling and bruising in the calf. Question: What is the most probable diagnosis, and what is the underlying mechanism of the injury? Hint: The , located on the posterior (back) of the femur, is responsible for knee flexion and hip extension. During sprinting, this undergoes rapid and forceful contractions. A sudden, intense contraction, especially when the is not adequately warmed up or stretched, can exceed the capacity, leading to the tearing of it’s fibers. This would explain the popping sensation felt by the athlete, followed by pain, swelling, and difficulty walking.

Which type of muscle tissue is found only in the heart?

Case Study: Scenario: A marathon runner, nearing the finish line, experiences intense fatigue, muscle cramps, and a feeling of “heaviness” in her legs. Question: What is the primary physiological factor contributing to these symptoms?

Which type of muscle tissue is found in the walls of blood vessels?

Case Study: A Marathon Runner Hits the Wall Scenario: A marathon runner is nearing the final miles of a race. She had been maintaining a steady pace, but now her legs feel heavy and weak. Her breathing becomes labored, and she experiences a sharp decline in her performance. She is experiencing muscle fatigue. Question: Considering the physiological factors contributing to muscle fatigue, which strategy would be the LEAST effective in helping the runner combat her fatigue and improve her performance in the final miles of the race?

Which type of muscle tissue is found in the walls of blood vessels?

Case Study: Investigating a Suspicious Death Scenario: A detective arrives at a crime scene where a body has been discovered in a locked room. The detective observes the following: ●The body is lying on the floor, face down. ●The limbs are stiff and difficult to move. ●The teeth and hands are clenched tightly. ●There are no obvious signs of injury or struggle. The detective estimates that the individual has been deceased for approximately 12 hours based on the temperature of the body and the presence of rigor mortis. Rigor mortis is a physiological change that occurs in the body after death, characterized by the stiffening of the muscles. Question: What is the underlying physiological mechanism responsible for the development of rigor mortis?

The recovery stroke of muscle contraction is powered by the breakdown of ATP into ADP and P.

Case Study: Scenario: A marathon runner, nearing the finish line, experiences intense fatigue, muscle cramps, and a feeling of “heaviness” in her legs. Question: What is the primary physiological factor contributing to these symptoms?