Q3 Lesson 1 Human Male Reproductive System PDF

 Reproduction! Adapted from J.L. Cook PPT Lecture Slides  The Reproductive System a system of organs that work together for the purpose of procreating. Many non-living substances such as fluids, hormones, and pheromones are also important accessories t...

 Reproduction! Adapted from J.L. Cook PPT Lecture Slides  The Reproductive System a system of organs that work together for the purpose of procreating. Many non-living substances such as fluids, hormones, and pheromones are also important accessories to the reproductive system The Reproductive System Gonads – primary sex organs Testes in males Ovaries in females Gonads produce gametes (sex cells) and secrete hormones Sperm – male gametes Ova (eggs) – female gametes  The Human Reproductive System Lesson #1: The Male Reproductive System Science 10 3rd Quarter Week 1 Adapted from J.L. Cook PPT Lecture Slides  Our Target for Today! 01 Identify and describe the parts and function of the male reproductive system. 02 Explain the role of hormones in male reproductive system The Male Reproductive System  Testes Each lobule contains one to four seminiferous tubules Tightly coiled structures Function as sperm-forming factories (spermatogenesis) Empty sperm into the rete testis (Efferent Ductules) Sperm Formation Mitosis  Anatomy of a Mature Sperm Cell The only human cell that is flagellated DNA can be found in the head  Testes Sperm travels through the rete testis to the epididymis Interstitial cells produce androgens such as testosterone (male hormone) Functions of Testosterone 1. Stimulates reproductive organ development 2. Underlies sex drive 3. Causes secondary sex characteristics Deepening of voice Increased hair growth Enlargement of skeletal muscles Thickening of bones  Other hormones ▪ Luteinizing Hormones (LH) – induces the release of testosterone ▪ Follicle stimulating Hormone (FSH) – induces the production and maturation of sperm Epididymis Functions to mature and store sperm cells (at least 20 days) Expels sperm with the contraction of muscles in the epididymis walls to the vas deferens Vas Deferens Carries sperm from the epididymis to the ejaculatory duct Moves sperm by peristalsis Ends in the ejaculatory duct which unites with the urethra Vasectomy Urethra Extends from the base of the urinary bladder to the tip of the penis Carries both urine and semen Mixture of sperm and accessory gland secretions  The Accessory Parts Seminal Vesicles Located at the base of the bladder Produces a thick, yellowish secretion (60% of semen) Fructose (sugar), Vitamin C, Prostaglandins, other substances that nourish and activate sperm  Prostate Gland Encircles the upper part of the urethra Secretes a slightly alkaline milky fluid Helps to activate sperm Bulbourethral Glands ❖Pea-sized gland inferior to the prostate ❖Produces a thick, clear mucus ❖ Cleanses the urethra of acidic urine ❖ Serves as a lubricant during sexual intercourse ❖ Secreted into the penile urethra  The External Genitalia  Scrotum Sac of skin and superficial fascia that hangs outside the abdominopelvic cavity at the root of the penis Contains paired testicles separated by a midline septum Its external positioning keeps the testes 3°C lower than core body temperature  Penis Copulatory organ, delivers sperm into the female reproductive tract Internally there are three areas of spongy erectile tissue around the urethra Regions of the penis Shaft Glans penis (enlarged tip) Prepuce (Fore Skin)