Chapter 4 Outline

The Male External Genitalia Are the Penis and Scrotum

• The Penis Combines Erotic, Reproductive, and Excretory Functions
• Box 4.1 Cultural Diversity: Male Circumcision
• Box 4.2: Research Highlights: How Big Should a Penis Be?
• The Scrotum Regulates the Temperature of the Testicles

Study questions: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16

The Testes Produce Sperm and Sex Hormones

• Box 4.3: Sexual Health: Disorders of the Testicles
• Other Glands Contribute Their Secretions to the Semen
• Box 4.4: Sexual Health: Disorders of the Prostate Gland
• What Is Semen?

Study questions: 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36

The Nervous System Orchestrates Sexual Arousal

• Box 4.5: Biology of Sex: The Nervous System
• Erection Can Be Mediated by a Spinal Reflex
• Erectile Tissue Forms a Hydraulic System
• Muscles Are Also Involved in Erection
• The Brain Influences Erection

Study questions: 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54

Ejaculation Requires Coordination of Muscles and Glands

• Box 4.6: Personal Points of View: Women and Men Describe Their Orgasms
• Emission Is the Loading of Semen into the Urethra
• Ejaculation Is Caused by Contractions of Many Muscles in the Pelvic Floor

Study questions: 55 | 56 | 57 | 58 | 59 | 60 | 61

Nudity Is Culturally Regulated

Study questions: 62 | 63