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15.1-15.5

IGCSE Human Reproduction

QuestionAnswer
Acrosome Contain enzymes that are released during fertilisation
Semen combinanation of sperm cell and fluid
Prostate gland secrete mucus, fluid in which the sperm cells can swim
Scrotum A sac where the testes are located
What caused orgasms for the woman? Repeated movements of the erect penis against the clitoris or against the vagina walls
Clitoris the sensitive part above the urethrea
Ejaculation Contractions of the urethra move the seminal fluid through the penis into the vagina
Vulva The outer opening of the vagina
Why are so many sperm cells produced? to increase the chance of some of them reaching the oviduct
How may a sperm cell succeed in penetrating an egg? Enzymes released by the acrosome on the head of the sperm digest a pathway through the jelly coat surrounding egg
How does the zygote stop other sperm cells from entering? A membrane is formed around the zygote/fertilised egg
How does the embryo moves down the oviduct? By peristaltic contractions or beating of the ciliated epithelial cells
What happens to embryo after implantation? Grows into finger-like projections or villi that penetrate the lining of the uterus
Placenta The organ that connects a mammalian embryo to its mother and through which it receives food and oxygen and removes carbon dioxide and chemical waste
What does the umbilical cord contains? contains an artery and a vein that carry the fetal blood to the placenta and back again
Role of the amnion/amniotic sac contains amniotic fluid that protect the fetus from mechanical damage in the uterus
Why are some babies born prematurely? Early breaking of the membrane (amnion) perhaps due to the mother smoking since nicotine and carbon monoxide can cross the placenta
Oxytocin Hormone released from pituitary gland that stimulates the muscles of the uterus to contract
Afterbirth The placenta comes away from the uterus wall when it's pushed out of the vagina
Passive immunity the child has the mother's antibodies in the blood, but unable to produce them itself
Created by: Klinh11N
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