Reproduction in human
Testis Anatomy 2203 (11:58)
by Professor William Krause, Ph.D.
Things to note:
- (01:00) Seminiferous tubules
- (01:07 & 2:40) Cells produce sex hormones (interstitial cell)
- (06:48) Cells produce sperm (spermatogenic cells)
- (08:43) Tail of sperm
Which of these Animals has the biggest Sperm? (05:16)
by Facts in Motion
Things to note:
- The size of sperm of organism depends on the size of organism (female reproductive tracts).
- Larger the organism, smaller the size of sperm but greater in quantity.
Ovulation - Nucleus Health (02:39)
by Nucleus Medical Media
Things to note:
- An ovum matures every month.
- Funnel of oviduct (infundibulum) collects ovum and passes to oviduct.
- Ovum requires beating action of cilia in oviduct and contraction of
muscles of oviduct to move along oviduct.
The Menstrual Cycle (02:06)
by KidsHealth.org
Things to note:
- Uterine lining shed if no fertilization and implantation occurs.
- Menstrual cycle lasts for 28 days.
- Menstruation lasts for several days.
Fertilization (05:42)
by Nucleus Medical Media
Things to note:
- About 300 million sperms enters vagina during copulation.
- Around ovulation, the cervix opens for a few days for sperms to enter.
- Reasons why sperms cannot reach ovum:
Flow out of vagina
Die in acidic environment
Caught in the folds of cervix
Trapped in mucus
Killed by immune system of female body
Swim to oviduct without unfertilized egg
Trapped by cilia in oviduct
3D animation of how IVF works (03:17)
by Patreskovic
Things to note:
- Female is given hormones to stimulate ova production.
- Semen collected is washed and concentrated.
- For each egg collected, only one sperm can fertilize it.
Labor and Delivery | Childbirth | Nucleus Health (03:04)
by Nucleus Medical Media
Things to note:
- Doctors may make a small cut (episiotomy) at vaginal opening to
enlarge the vaginal opening.
- After baby's head get out of vaginal opening, its shoulder and head
would rotate to help its shoulders pass through birth canal.