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sexual reproduction - Coggle Diagram

- - - - Between 10 to 12 years old
        
        Sex hormones which trigger the start of puberty
        
        oestrogen n progesterone
        
        Production of mature eggs or ovulation starts
        
        Breasts enlarge and hips broaden
        
        Growth of pubic hair and armpit hair
        
        Growth spurt (grow suddenly)
        
        Onset of menstruation
  - - - Between 12 to 14 years old
        
        Sex hormones which trigger the start of puberty
        
        Testosterone
        
        Production of sperms
        
        Penis and testes increase in size
        
        Voice deepens
        
        Growth of pubic hair and armpit hair
        
        Growth spurt (grow suddenly)
- - - - During sexual intercourse, semen which contains millions of sperms is discharged in the vagina. The sperms swim towards the fallopian tube from the vagina to meet the mature egg. The egg is surrounded by millions of sperms. Only one sperm can penetrate and fertilise it. The fertilised egg is called zygote. Its nucleus contains 23 pairs of chromosomes after fusion of both nuclei from the male and the female gametes
        
        the zygote starts to move towards the uterus with the help of tiny hairs on the wall of the fallopian tube.
        
        at the same time, the zygote starts to divide into a ball of cells called embryo
        
        About 7 days to embryo is just a uterus
        
        Subsequently, the embryo embeds itself into the uterine wall this process is called implementation
        
        the blood vessels in the uterine lining provide essential nutrients for the embryo to develop after a few months, the embryo grows into a foetus which is an unborn baby
  - - - To deliver nutrients and oxygen to the foetus
      - o remove waste substances and carbon dioxide from the baby
- - - - day 6 to 10
        
        The uterine lining starts to repair and thicken due to the effect of oestrogen
        
        day 11 to 17
        
        Ovulation usually occurs on day 14 of the cycle. A mature egg is expected to release from one of the ovaries.
        
        The egg is released into the fallopian tube for possible fertilisation.
        
        An egg can survive about 48 hours. Hence, day 11 to 17 are called the fertile period because a woman is likely to get pregnant if she has sexual intercourse.
        
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  - - - Emotional disturbance
      - Stress
      - Mental fatigue
      - Illness
      - Unbalanced diet
      - Malnutrition
- - - - Allows fertilization to take place
    - - Allows implantation of the embryo for growth and development
    - - Produces mature eggs
      - produces female sex hormones
    - - A narrow opening which widens during childbirth
    - - A muscular organ where sperms are deposited
  - - - they mature at the rate of about one egg in every month
- - - - Sexually reproduction is a type of reproduction whereby two a gametes (or sex cells) fuse together to form a fertilized cell or zygote
      - It involves two parents
        
        fertilisation
        
        A male gamete and a female gamete fuse together to form a zygote
        
        example
        
        reproduction in humans
    - - Asexual reproduction is a type of reproduction where but it does not involve the fusion of gametes
        
        example
        
        budding
        
        A cell splits to produce a 'mother' cell and a 'daughter' cell.
        
        the mother cell is larger than the daughter cell
        
        example
        
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        fission
        
        A cell divides into two identical daughter cells
        
        example
        
        fungi
        
        bacteria
      - It involves one parent only
- - - - An organ which deposit semen containing sperms in a woman's vagina during sexual intercourse
    - - Carries urine and semen to the outside of the body at different times
    - - Produce seminal fluids called semen which is mixed with sperms
        
        he fluid provides nutrients
        
        and lubricates the sperms to facilitate their movement.
    - - Carry sperm from one testes to the urethra
    - - Stores sperms temporarily
    - - Producers sperms and male hormones called testosterone
    - - Holds testes outside the body
        
        This allows the testes to maintain a temperature below the body temperature
        
        because the sperms can develop better at a lower temperature