Let's construct a diagram of the knee jerk reflex starting with the sensory pathway. Fill in the blanks using the terms in the table below (see Fig. 43.28 and 44.1). Boldfaced terms should go into the (). When a hammer hits the patellar __________, the __________ (__________) stretches slightly, which opens __________- gated __________ in the __________ __________ which is part of the __________ nervous system. __________ rush into the __________ cell, triggering a(n) __________ __________ in the __________. If the hammer tap (__________) is strong enough, the __________ __________ reaches __________ and causes a(n) __________ __________. This __________ __________ is __________ along the __________ towards the __________. Note: Terms can be used more than once. Axon Spinal chord Action potential Propagated Receptor potential Threshold Muscle spindle Sensor Stimulus Tendon Sodium ions Mechanically Sensory neuron Peripheral Ion channel Membrane potential