Question

question 49 (1 point)
which of the following statements is correct?
two myofibrils intertwine and form a single muscle fiber.
increased protein synthesis in the myosin and actin myofibrils causes myofibrillar hypertrophy.
people who train for strength and power will be training for sarcoplasmic hypertrophy.
muscle cells are the basic subunit of sarcomeres.
myofibrils are the basic contractile element of a muscle.

Explanation:

1. Muscle fibers are made up of many myofibrils, not just two intertwining to form one fiber.
2. Increased protein synthesis in myosin and actin myofibrils indeed causes myofibrillar hypertrophy as more contractile proteins lead to growth of the myofibrils.
3. People training for strength and power typically aim for myofibrillar hypertrophy, not sarcoplasmic hypertrophy which is more related to endurance - related adaptations and increased glycogen storage.
4. Sarcomeres are the basic unit of muscle cells, not the other way around.
5. Sarcomeres are the basic contractile elements of a muscle, not myofibrils.

Answer:

Increased protein synthesis in the myosin and actin myofibrils causes myofibrillar hypertrophy.