Final answer:
Perceptive neuromuscular facilitation (PNF) is described as Stretching with contraction and relaxation. It employs the nervous system's control of muscle tension to improve flexibility and strength. (option C is the correct answer).
Step-by-step explanation:
The activity that best describes perceptive neuromuscular facilitation (PNF) is Stretching with contraction and relaxation. PNF is a method of stretching muscles to enhance both their flexibility and strength. This involves stretching a muscle until it feels tight, and then contracting the stretched muscle for several seconds, often against resistance. After the contraction, the muscle is briefly relaxed, and then a deeper stretch is performed. This cycle can be repeated several times.
PNF utilizes the nervous system's control of muscle tension by engaging both muscle fiber recruitment and muscle tone. Motor units, which comprise motor neurons and the muscle fibers they innervate, regulate muscle contractions through the sliding filament model. This coordinated effort by the nervous system allows for increased flexibility and prevention of injury, which can be beneficial for a variety of physical, mental, and emotional health outcomes.