Which of the following sentences is NOT correct? A. White fibers make up fast-twitch muscle B. Muscle spindle is a type of receptor that detects muscle length C. Exocrine gland secretes its product...

Extracted text: Which of the following sentences is NOT correct? A. White fibers make up fast-twitch muscle B. Muscle spindle is a type of receptor that detects muscle length C. Exocrine gland secretes its product directly into the bloodstream D. When an action potential is generated within a motor neuron, every muscle cell of the motor unit is stimulated to contract