Final answer:
Emotions are subjective experiences that consist of physiological arousal and cognitive appraisal. The James-Lange theory, Cannon-Bard theory, and Schachter-Singer two-factor theory are different theories that explain emotions.
Step-by-step explanation:
Emotions are subjective experiences that consist of physiological arousal and cognitive appraisal. There are several theories that explain emotions. The James-Lange theory asserts that emotions arise as a function of physiological arousal, while the Cannon-Bard theory maintains that emotional experience occurs simultaneous to and independent of physiological arousal. The Schachter-Singer two-factor theory suggests that physiological arousal receives cognitive labels as a function of the relevant context and that these two factors together result in an emotional experience.