Final answer:
The familiar type of reflex that monitors and regulates the length of skeletal muscles is the stretch reflex.
Step-by-step explanation:
The familiar type of monosynaptic reflex that monitors and regulates the length of skeletal muscles is the stretch reflex. In this reflex, when a skeletal muscle is stretched, a muscle spindle receptor is activated, causing direct contraction of the muscle. The reflex helps maintain muscles at a constant length. An example of this reflex is the knee elicited by a rubber hammer struck against the patellar ligament in a physical exam.