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Reproduction
Junior cert biology
Question | Answer |
---|---|
what process begins on day 1 of the menstrual cycle | menstruation occurs |
what is meant by the fertile period | ovulation occurs |
what happens to the egg during fertilsation | it joins with sperm |
during what days is menstruation likely to occur | days 1 to 5 |
amount of chromosomes in a human nucleas | 23 |
2 substances from which chromosomes are made | DNA and protein |
name a form of contraception | abstinence |
function of sperm head | contains nucleas |
function of sperm tail | movement |
functions of placenta | food passes from mother to baby oxygen passes from mother to baby |
function of umbilical cord | carries nutrients to baby |
explain events during end of pregnancy | uterus contracts waters break umbilical cord is tied and cut breasts produce milk |
where does fertilisation occur | fallopian tube |
why does sperm need to be able swim | to meet the egg |
what happens in the ovary | egg is released |