1. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Male Reproductive System Bellringer List 6 things each that you know about the male reproductive system. 8 th Grade

2. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Copyright © by Holt, Rinehart and Winston. All rights reserved. Male Reproductive System What the Male Reproductive System does… 8 th Grade Works to produce sperm and deliver it to the female reproductive system Sperm – sex cells produced by the testes which are needed to fertilize an egg Eggs (ova) – sex cells produced by the ovaries which can be fertilized by sperm Fertilization – the process by which a sperm and an egg and their genetic material join to create a new human life Reproduction – the process of producing a new human

3. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Male Reproductive System 8 th Grade Testes (Testicle) –Male reproductive organs (gonads) that make sperm and testosterone –Produce several hundred million sperm each day –Produce testosterone and male hormones

4. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Male Reproductive System 8 th Grade Testes (Testicle) cont… The 2 testes rest in the scrotum –Scrotum - Skin-covered sac that hangs from the body –Muscles in the scrotum move the testes closer or farther from the body to regulate temperature of sperm This movement is called the cremasteric reflex

5. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Male Reproductive System 8 th Grade Penis –The male reproductive organ that removes urine from the male’s body and that can deliver sperm to the female reproductive system –Made of soft tissue and blood vessels –During sexual activity, the penis becomes erect or firm Ejaculation – occurs when sperm are released from the penis after sexual excitement –Urethra – a passage for urine to leave the body –Foreskin – a sheath of skin that covers the tip of the penis Circumcision – surgery to remove foreskin

6. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu 8 th Grade Male Reproductive System Epididymis and Vans Deferens –Epididymis – tightly coiled tube where sperm mature and are stored –Vas Deferens – a long tube where sperm mix with fluids made by three accessory reproductive organs

7. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu 8 th Grade Male Reproductive System Seminal Vesicles –Found near the base of the urinary bladder –Produce thick secretions that nourish the sperm and help sperm move easier

8. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu 8 th Grade Male Reproductive System Prostate gland –A gland in males that adds fluids that nourish and protect sperm when the sperm are in the female body. –Secretes a thin, milky fluid that protects the sperm from acid in the female reproductive system

9. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu 8 th Grade Male Reproductive System Semen –Mixture of sperm and other secretions from the male reproductive organs

10. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu 8 th Grade Male Reproductive System Urethra –Tube that passes through the penis. –2 main functions: Urine leaves the body during urination Sperm leave the body during ejaculation via this tube

11. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Male Reproductive System 8 th Grade Testosterone –The male hormone made by the testes –Helps protect against osteoporosis –Increases energy and libido (sex drive)

12. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Male Reproductive System 8 th Grade What happens if sperm get to hot? –Sperm made at high temperatures are defective and cannot fertilize eggs.

13. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Male Reproductive System 8 th Grade What 3 parts make up the sperm? What is the function of each part? -the head contains substances that help the sperm enter the egg. - the mid piece contains structures that release the energy needed for the long trip through the female reproductive system. - the tail is made of proteins that help the sperm move.

14. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Male Reproductive System 8 th Grade How long does it take an immature sperm to mature? How long can sperm live? –An immature sperm takes 2 – 10 days to fully mature. –Sperm can live for up to 5 days in the fallopian tubes of a female, increasing their chances of fertilizing an egg

15. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Male Reproductive System 8 th Grade What 3 organs add fluid to the sperm? –The seminal vesicle, bulbourethral glands (Cowpers glands) and the prostate gland

16. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Male Reproductive System 8 th Grade What prevents urine and semen from going through the penis at the same time? –A flap in the urethra prevents urine and semen from going through the penis at the same time.

17. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu What are some signs that a make is going through puberty? –Shoulders get wider, the muscles get larger, hair grows on the face and other parts of the body, and the voice deepens. At this time testosterone also causes the body to start making sperm. 8th Grade Male Reproductive System