1. Reproductive Systems

2. Puberty HORMONES: substances that act in the body like messengers PUBERTY: period of time in the mid teens when reproductive hormones signal the body so can prepare for reproduction Pituitary gland in brain releases follicle stimulating hormone (FSH) to the gonads (ovaries and testes) to tell them to produce gametes (eggs and sperm) Testosterone in males and estrogen in females signals development of SECONDARY SEX CHARACTERISTICS such as hair growth, body structure changes, voice changes

3. Male Reproductive System Designed to produce as many healthy sperm as possible TESTES: produce sperm cells, located outside of the body in a sac called the SCROTUM Sperm need to be slightly cooler than the rest of the body so the scrotum can move to stay at ideal temperature SEMINIFEROUS TUBULES: produce about 350 to 500 million sperm a day EPIDIDYMIS: coiled tube take takes the sperm out of the testes and into the body The epididymis enters the body and is then called the VAS DEFERENS, this takes the sperm in a loop around the bladder

4. Male Reproductive System 2 PROSTATE GLAND and SEMINAL VESICLES add thick sugary fluid to the sperm to provide energy for the sperm to swim SEMEN: sperm + sugary fluid from prostate gland and seminal vesicles URETHRA: tube through the center of the penis that carries sperm and urine outside the body Vas deferens joins the urethra A muscular valve prevents urine and sperm from exiting at the same time Sperm has a head with a nucleus inside, a hat filled with enzymes and a tail for swimming

5. Male System

6. Male Repro System

7. Sperm

8. Homework Make a chart with the male reproductive structure in the first column and its function in a second column