Few people have blood type B negative (about 5%), and even ____ have AB negative which is the rarest blood type The most common blood type is O positive. ____ 36% of people have this type of blood. Finger nails grow at an ____ of about 36 millimeters a year, which is 3 millimeters in a month. That's much faster than toe nails, which grow ____ four times ____ slowly - about 0.75 millimeters a month. When people sing their national anthem, they often hold the left side of their chest, thinking that they are placing their hand over their heart. But in ____ our heart Is near the ____ of our chest, just a ____ to the left. The average length of the small ____ in adults is seven metres. The average length of the large intestine is one and a half metres, so that's eight and a half metres in ____. As adults, we have 206 bones in our bodies, but we start life with many more. We are born with ____ 300 bones, but as we grow, some of them ____ together, ____ US with 206. The blonder our hair, the more ____ we have on our scalp. Fair-haired people have on average 150,000 hairs, brown- haired people have 110,000, and black-haired people about 100,000. People with ginger hair have got the fewest: about 90,000 hairs. Most people don't think of their skin as an ____, like their heart, kidney, stomach and liver. But that's what it is. And it's the largest organ, by ____ area and ____. The average brain weighs 1.3 kg and is the third largest organ in our body. The ____ is also very large and weighs even more: on average 1.6kg. But the surface area of skin on an average adult's between 1.5 and 2 m2 and it weighs on average 10.8 kg. The thickness of our skin ____ from about 0.5 mm on our eyelids to 4 mm or more on the ____ of our feet and on the ____ of your hands. But on average it is 2-3 mm thick. Where is the largest muscle in our body? Different experts have different opinions. Some say it is the masseter muscle in our ____, which helps us chew our food. Others say it is the muscles in our ____, which allow us to run. Other experts believe it is the gluteus maximus in our ____ and lower ____, which holds our bodies upright. What is certain is that the largest muscle is the gluteus maximus, but it is impossible to say which is the ____ because they do such different things.

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