Final answer:
The first phase of the human sexual response cycle is the excitement phase, which involves arousal and preparation of the body for sexual activity. This phase precedes plateau, orgasm, and resolution.
Step-by-step explanation:
When describing the human sexual response cycle, the first phase that occurs is excitement. In this phase, which precedes plateau, orgasm, and recovery (resolution), psychological and physical stimulation lead to vasocongestion in erectile tissues and the engorgement of sexual organs, as well as the lubrication of the vaginal canal in females. The first phase of the sexual response cycle is crucial as it prepares the body for sexual activity.
During the plateau phase, arousal continues to build with the expectation of reaching orgasm. The orgasm phase is then characterized by rhythmic contractions and in males, ejaculation. Finally, after climax, individuals enter the resolution phase, during which the body returns to an unaro-used state, and men typically experience a refractory period.
Therefore, to answer the student's question, when describing the human sexual response cycle, a nurse would include excitement as occurring first among the options provided.
Additionally, during the orgasm phase, individuals experience rhythmic contractions of the pelvis, with uterine contractions in females and ejaculation in males.