PSY 145 Study Guide 4 (1).docx - PSY 145-01 Human Sexuality...

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PSY 145-01: Human Sexuality: Study Guide 4 <Your Name Here> Human Sexuality Today – Chapter 4 Study Guide 1. What are the four phases of the sexual response cycle described by Masters and Johnson? What are the three phases proposed by Kaplan? What is the five-phase model which combines the two? (p. 81-82) The four phases of sexual response cycle described by Masters and Johnson are excitement, plateau, orgasm, and resolution. The three phases proposed by Kaplan are desire, excitement, and orgasm. The five-phase model which combines the two are desire, excitement, plateau, orgasm, and resolution. 2. In males, how many centers in the spinal cord are responsible for erection? Which part is responsible for reflexive erection, and which part is responsible for psychologically caused erections? (p. 83) In males, there are two centers in the spinal cord that are responsible for erection. The sacral erection center is responsible for reflexive erection and the thoracolumbar erection center is responsible for psychologically caused erections. 3. Describe the two stages of orgasm in males? Are ejaculation and orgasm the same event? (p. 85) The two stages of orgasm in males are emission and expulsion. In stage 1 (Emission), there are rhythmic muscular contractions in the vas deferens, prostate gland, and the seminal vesicles push sperm, prostate, and seminal fluids into ejaculatory ducts, which forms the semen. The sphincter muscles contract and close parts of the urethra that go through the prostate. In stage 2 (Expulsion), contractions are joined by contractions in the urethra and muscles at the base of the penis to ejaculate semen from the penis. The sphincter muscles around the urethra from the bladder are tightly contracted so urine is

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