Katie has been diagnosed with breast cancer and is under significant stress. She is undergoing a series of chemotherapy treatments. Her endocrine and sympathetic nervous system activity are elevated and the circulation of hormones that reduce the inflammation normally associated with injury is also at a high level. According to Hans Selye, Katie is currently in the stage of the general adaptation syndrome (GAS).

resistance

Explanation:

The general adaptation syndrome (GAS), was developed by Hans Selye and it was used in describing the pattern of responses which the body goes through after it has being prompted by a stressor.

It should be noted that there are three stages of GAS which are alarm, resistance, and exhaustion.

Alarm occurs when the body perceives a particular thing as being stressful.

Resistance occurs when therenuw continuity of the perceived stress, which then leads to the body staying activated at a higher metabolic level so that the stress can be offset.

Exhaustion occurs when there's prolonged exposure to the stressor which will then will lead to the body’s resources to be depleted which will then suppress the immune system.

Based on the information given, Katie is currently in the resistance stage of the general adaptation syndrome (GAS).