sexual intercourse

• what causes the venules leaving the penis to contrict

  arterioles entering the penis and dilating
• what causes the penis to become erect

  the build up of blood
• what happens in intercourse after the penis is erect

  it is inserted into the vagina
• what results in ejaculation

  movements of the penis
• what will happen to sperm when it is ejaculated

  it will propel some of the sperm through the cervix into the uterus
• what happens to the sperm that doesn't reach the uterus and the cervix

  it will remain in the top of the vagina
• what causes the sperm to swim to the oviduct

  they respond to chemoattractants
• where is chemoattractant released from

  the secondary oocyte
• how long is sperm viable for

  2-5 days
• when are sperm most fertile

  12-24 hours after ejaculation
• when will the secondary oocyte be in the oviduct

  recently after ovulation
• how long are secondary oocytes viable for

  24 hours