1. Reproductive systems
Human reproduction possible due to sex hormones (found in male testicles and female ovaries) which tells those organs to produce gametes
Sex hormones begin at puberty

2. At puberty your pituitary glands start releasing sex hormones
Male (testosterone)
Females (proesterone, estrogen)
Puberty also leads to physical changes (pubic hair, larynx(boys), breasts)

3. Male reproductive organs produce spermatozoa
Scrotum (pouch which contains testicles)
Testicles (contain seminiferous tubles)
Seminiferous tubles (produce gametes)
Vas deferens (enter/exit channel for spermatozoa)
Urethra (exit for semen/urine)

5. Female reproductive organs produce ova
Ovaries ( release one ovum every 28 days)
Follicles (each contain a single ovum)
Fallopian tubes (sends ovum to uterus)
Uterus ( hollow organ which holds the ovum if fertilized)
Vagina ( exit for baby)

7. Menstrual cycle
The menstrual cycle causes changes to the female reproductive organs
The lining of the uterus thickens to help the zygote implant in the uterus and begin its development

8. Pregnancy When one sperm cell succeeds in fertilizing the ovum
Implants in the uterus
Zygote takes shape into embryoblast
External cells of the zygote will form plancenta (carries nutrients/oxygen to fetus)
Embryoblast becomes embryo
After 8 weeks embryo becomes fetus

9. STIs
Two types:
Viral (cause by a virus)
Bacterial (cause by bacteria)

10. Bacterial infections
Syphilis: Starts off as painless sores if untreated can lead to cardiac problems, damage to nervous system, and eventually death.
Gonorrhea: Symptoms appears a few days after infection. Burning sensation during urination, thick yellow discharge from penis, painful and/or swollen testicles.
Chlamydia: Symptoms appear a few weeks after infection. Similar to gonorrhea.

11. Viral STIs
Hepatitis B, C: Early symptoms include loss of appetite, nausea, vomiting, jaundice. Can cause permanent liver damage.
HIV: Renders immune system ineffective.
Genital herpes: Early symptoms begin as tingling sensation on or around genital area. Eventually become painful blisters and ulcers.
Oral herpes: Cold sores.

12. Contraceptives Protect against pregnancy, not all STIs Examples:
The pill (female contraceptive)
Condom
Diaphragm