Physiology & Rehabilitation MCQs

During a prolonged, low-intensity endurance activity such as marathon running, which of the following muscle fiber types is predominantly recruited, and what is its primary metabolic pathway?

During an eccentric muscle contraction, how does the force-velocity relationship primarily differ from that of a concentric muscle contraction?

Which of the following physiologic and morphologic characteristics best describes Type I skeletal muscle fibers?

During rehabilitation of a reconstructed anterior cruciate ligament, understanding muscle physiology is critical. Which type of muscle contraction generates the highest maximal force or tension within the muscle-tendon unit?

During a marathon, a runner relies primarily on Type I skeletal muscle fibers. Which of the following best describes the metabolic characteristics of Type I fibers?

A patient walks with a compensatory Trendelenburg gait, shifting their trunk laterally over the stance leg. This gait adaptation is primarily designed to reduce the mechanical demand on which of the following muscles?

During the descent phase of a deep squat, the quadriceps muscle actively lengthens to control the downward movement. Which type of muscle contraction is taking place?

During the early stance phase of the normal gait cycle, the quadriceps muscle contracts to control knee flexion. This type of muscle contraction is best described as:

During the normal gait cycle, the knee relies on the 'screw-home' mechanism for locking in full terminal extension. Which muscle is primarily responsible for 'unlocking' the knee from extension to initiate flexion?

Which of the following physiologic characteristics is true regarding Type I skeletal muscle fibers when compared to Type IIb fibers?

During the normal gait cycle, at what phase does the maximum force on the hip joint occur?

During a physical therapy session, a patient is performing a quadriceps strengthening exercise on a specialized machine that provides accommodating resistance to maintain a constant angular velocity of the knee joint throughout the entire range of motion. What type of muscle contraction is this?

During the normal human gait cycle, at what point does the maximum compressive force occur across the hip joint?

A 45-year-old weightlifter experiences an acute distal biceps tendon rupture. This specific injury biomechanically occurs most frequently during which type of muscle contraction?

During the controlled descent phase of a barbell squat, the quadriceps muscle lengthens while continuing to generate tension to control the rate of knee flexion. What type of muscle contraction is primarily occurring in the quadriceps?

Following an inadvertently intravascular injection of bupivacaine during a hematoma block, a patient develops perioral numbness, tinnitus, and generalized seizures. This local anesthetic systemic toxicity (LAST) is primarily mediated by the blockade of which of the following channels in the central nervous and cardiovascular systems?

Which of the following lubrication mechanisms relies primarily on the glycoprotein lubricin (PRG4) to prevent cartilage-to-cartilage contact under conditions of high load and low relative velocity?

During a normal adult walking gait cycle, the peak maximum muscle contraction of the ankle plantar flexors (gastrocnemius-soleus complex) occurs during which specific phase?

During the normal human gait cycle, at which phase does the tibialis anterior muscle reach its absolute peak of electrical activity?

During the rehabilitation phase following an Achilles tendon repair, a patient performs 'heel drops', slowly lowering their heel below the level of a stair step. Which type of muscle contraction is predominantly utilized by the gastrocnemius-soleus complex during the lowering phase?