MICROANATOMY

Detailed explanation-1: -Each individual muscle fiber in a muscle is innervated by one, and only one, motor neuron (make sure you understand the difference between a muscle and a muscle fiber). A single motor neuron, however, can innervate many muscle fibers.

Detailed explanation-2: -The false statement is that “skeletal muscle cells use creatine phosphate instead of ATP (adenosine triphosphate) to do work".

Detailed explanation-3: -A motor unit is made up of a motor neuron and all of the skeletal muscle fibers innervated by the neuron’s axon terminals, including the neuromuscular junctions between the neuron and the fibres. Groups of motor units often work together as a motor pool to coordinate the contractions of a single muscle.

Detailed explanation-4: -The correct answer is (b) They work in antagonistic pairs. Skeletal muscles are the muscles that pull on bones to cause bodily movements.