By Richard Walker
Readers embark on a beautiful voyage via human biology and become aware of the body’s fine details as they’ve by no means obvious them prior to. starting with the elemental development blocks, carrying on with to the physique in motion, and concluding with the body’s platforms, it is a compact and finished examine the beauty that's the human laptop.
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Extra resources for Amazing Human Body (Dk)
In the dark there is little or no light so we are unable to see. Fovea is the most sensitive part of the retina Radial muscle fibres relax muscle Q Why do my pupils Circular fibres contract change size? A Your coloured irises automatically control the size of your pupils and, therefore, the amount of light that enters your eyes. Without this control you would be dazzled in bright light and unable to see in dim light. Circular muscle fibres in your irises close your pupils in bright light, and spoke-like radial muscle fibres contract to open your pupils in dim light.
Every chromosome carries many genes. Each gene consists of a short section of the long, coiled DNA molecule that makes up the chromosome. A gene’s DNA holds the coded information needed to make one of the many proteins that make your body work. Computer model of a chromosome How are identical twins the same? When humans reproduce, slightly different DNA instructions from each parent come together in the fertilized egg to create a unique individual. These develop into twin babies that look identical because they share exactly the same DNA.
60-61 Corbis: Visuals Unlimited. 62-63 Corbis: Photo Quest Ltd/ Science Photo Library Jacket images: Front: Science Photo Library: Susumu Nishinaga (background); Pasieka c (skull).