4Why do humans need a skeleton? So they can stand and walk.Can you think of another reason why humans need bones? One minute group talk.
5Bones. Page 4The human skeleton has many bones. Bones are hard on the outside, but they have soft bone marrow inside. Bone marrow makes all the blood in the human body. Most humans have about 5.6 litres of blood!
6Blood is made up of red blood cells and white blood cells Blood is made up of red blood cells and white blood cells. Red blood cells take oxygen to all parts of the body. White blood cells help the body fight diseases.
8Bone marrow – Litre – Cell – Oxygen – Diseases - Fatty tissue that fills the space inside bones.Measurement of 1,000 millilitres.The smallest structural block of all living things.The part of air needed for breathing and living.Something harmful to a living thing that causes illness.
9Who thinks they know how many bones are in the human body Who thinks they know how many bones are in the human body? 30 seconds to think and guess.
10Human babies are born with more than 300 bones, but adults only have 206. The other bones do not disappear. They join together. Babies need more bones so it is easier for them to come out of their mothers’ bodies. Your bones are alive! So if you break a bone, it will heal.
11Disappear – Alive – Heal - Not able to see anymore.Disappear – Alive – Heal -Living.To make healthy and whole again.
12Teeth. Page 6Teeth are very small bones. They help people eat. Human babies get their first teeth between six months and one year. These teeth fall out at the age of seven and new teeth grow in their places.
13Humans have different kinds of teeth. Incisors – These teeth are the sharpest. They are for biting and cutting food.Canines – These teeth are for tearing food. Animals like lions have very big teeth like these.Molars – These teeth are big and flat. They are for chewing food.
15Fall out – Bite – Tear – Chew - To drop. Teeth will drop from the gum to make room for new ones.Fall out – Bite – Tear – Chew -Use the teeth to cut something.Pull or rip into pieces.Repeated biting to make food easier to swallow.
16The skull and the spine. Page 7 The skull and the spine are two very important bones. The skull protects the brain, and the spine protects the spinal cord. The spinal cord carries messages to the brain from the rest of the body. The spine also holds the body straight.
17Skull – Spine – Protect – Spinal cord – Message – Accident - The bone that is around the brain.The series of bones that go from below the skull to the end of your lower back.Keep safe from harm or injury.The bundle of nerves in the spine.Sent information. The spinal cord uses signals to send messages.Something that results in injury that is not caused on purpose.
19Paralyzed – unable to move. You may hurt your spine in an accident. This actor (Christoper Reeve) played Superman. One day, he fell off a horse and broke his spine. He could never use his arms or legs again.Paralyzed – unable to move.
20Joints. Page 8.Joints keep bones together. Without joints, the skeleton would be stiff and could not move. The joints in the hips and shoulders can make them move in a circle. The joints in knees and elbows can make them move 180 degrees up and down.
21Interesting facts. Page 9 More than half of the bones in the body are in the hands and feet! There are 27 bones in each hand and 26 in each foot.There are 14 bones in a human’s face!The thigh bone in the leg is the longest bone in the body. The smallest bone is in the ear!Humans and giraffes have the same number of bones in their necks! The giraffe’s bones are just bigger and longer.
24Both humans and giraffes have seven bones in their necks.
25Decide which sentences are true, and which are false. Bone Quiz. Page 10Decide which sentences are true, and which are false.
26Discussion questions.What do you think is the most useful part of the human body?What do you do to look after your body?Do you think the human body will change in 1,000,000 (million) years, why/why not?