Human Reproduction

The human male reproductive system contains these parts: glands, sperm ducts, urethra, penis and testes
The sperm pass through the sperm ducts, and mix with fluids produced by the glands. The fluids provide the sperm cells with nutrients. The mixture of sperm and fluids is called semen.
The two testes (one of them is called a testis) are contained in a bag of skin called the scrotum. The testes have two functions: to produce millions of male gametes (sex cells) called sperm to make male sex hormones, which affect the way a man's body develops
The penis has two functions: to pass urine out of the man's body to pass semen out of the man's body
The urethra is the tube inside the penis that can carry urine or semen. A ring of muscle makes sure that there is no chance of urine and semen getting mixed up.
The human female reproductive system contains these parts: oviducts ovaries uterus cervix vagina
The two ovaries contain hundreds of undeveloped female gametes (sex cells). These are called ova or egg cells. Women have these cells in their bodies from birth, whereas men produce new sperm continually.
Each ovary is connected to the uterus by an oviduct. This is sometimes called a Fallopian tube. The oviduct is lined with cilia, cells with hair on the tips. Every month, an egg develops, becomes mature and is released from an ovary. The cilia waft the egg along inside the oviduct and into the uterus.
The uterus, also called the womb, is a muscular bag with a soft lining. The uterus is where a baby develops until its birth.
The cervix is a ring of muscle at the lower end of the uterus. It keeps the baby in place while the woman is pregnant.
The female reproductive system includes a cycle of events called the menstrual cycle. It lasts about 28 days. It stops when the woman is pregnant.
At about day 14, the mature egg cell is released from the ovary. This is called ovulation. The egg cell travels through the oviduct towards the uterus.
Gametes are sex cells
Fertilisation In sexual reproduction, a male gamete and a female gamete join together. This is fertilisation.
The fetus relies upon its mother as it develops. These are some of the things it needs: protection against knock and bumps, and temperature changes oxygen for respiration nutrients (food and water), the developing fetus also needs its waste substances removing. The fetus is protected by the uterus and the amniotic fluid, a liquid contained in a bag called the amnion.
THe placenta provides oxygen, food and water and removes waste for the baby.
the mothers lifestyle effects the foetus.
The cervix relaxes and muscles in the wall of the uterus contract. Waves of muscle contraction push the baby out of the mother's body through the vagina.
Most girls begin puberty between ages 8 and 14, with an average of 11. Girls develop more quickly than boys and most finish puberty within four years. Most boys begin puberty between ages 9 and 14, with an average of 12. Most boys finish puberty within six years.
Puberty to boys= voice breaks, testes and penis get bigger, testes start to produce sperm cells, shoulders get wider and hair grows on face and chest
Puberty to girls=breasts develop, ovaries start to release egg cells (the menstrual cycle starts), hips get wider
General puberty=underarm hair grows, pubic hair grows, body smell gets stronger, emotional changes, growth rate increases

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Human Reproduction

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