If professor gannon were to argue that incoming pain sensations must pass through an opening in the spinal cord and that this opening could be closed, thus blocking ascending pain signals, which theory would dr. gannon be arguing

The correct answer is gate-control theory of pain.

The gate control theory of pain assume that non-painful input closes the "gates" to painful input. As a consequence, pain sensation cannot travel to the central nervous system (CNS) and thus, stimulation by non-noxious input can suppress pain.

Gate control theory

Explanation:

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

the backbone of the dna and rna compound is sugar phosphate.