By Richard Walker
Readers embark on an exquisite voyage via human biology and realize the body’s bits and bobs as they’ve by no means noticeable them earlier than. starting with the elemental development blocks, carrying on with to the physique in motion, and concluding with the body’s structures, it is a compact and complete examine the beauty that's the human desktop.
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Additional info for Amazing Human Body (Dk)
Four days after fertilization, a ball of 32 cells is ready to leave the fallopian tube. Two days later, inside the uterus, a hollow ball of cells called a blastocyst has been formed. 2-cell stage 32-cell stage Uterus lining has lots of blood vessels Embryo develops from these cells Yolk sac feeds the embryo in its first weeks Amnion forms protective bag around the embryo Q Where does a baby grow? A Just over a week after fertilization, the blastocyst burrows into the soft lining of the uterus to continue its development.
In males they target the genitals, causing the release of male sex hormones and stimulating sperm production. It is the sex hormones that trigger the changes in girls’ and boys’ bodies. ■ In girls, puberty generally begins between the ages of 10 and 12, while in boys it is between 12 and 14. The full-sized brain has a complete neural network, and immovable sutures lock the skull bones together. Neural network at 6 years Neural network at birth More Facts 3 Q What is the menstrual cycle? A This sequence of events, which repeats itself on average every 28 days, prepares the uterus to receive a fertilized egg.
39 Pumping blood Why is blood red? How fast does my heart beat? What journey does my blood take? How does my body protect itself? 42 44 46 48 Neutrophils hunt and eat invading germs Blood cells Red blood cells carry oxygen from the lungs to the tissues Platelets are cell fragments that play a key role in blood clotting Monocytes track down and destroy pathogens Why is blood red? Lymphocytes are white blood cells that release germ-killing chemicals Your body’s cells need a constant supply of food, oxygen, and other essentials, as well as a prompt removal of wastes, to stay alive.
Amazing Human Body (Dk) by Richard Walker