By Helen and Mark Warner
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1 By Helen and Mark Warner Teaching Packs - The Human Body - Page 1 Image ThinkStock
2 In this section, you will learn about The major systems and organs in the human body. 2. How our bodies change as we go through the stages of the human life cycle. The body has many organs that do special jobs. Here are some of the most important ones. Some parts of the body work together to form a system: Circulatory System This supplies essential substances to (and removes waste from) the cells in the body and helps it to fight infection. Skeletal System The skeleton protects the organs and allows the body to move. Urinary System Processes blood and removes waste urine. Nervous System The main control system of the body. Respiratory System The process of breathing provides cells with oxygen and removes carbon dioxide from the body. Digestive System Takes in and processes food. Teaching Packs - The Human Body - Page 4 Brain (controls the whole body) Lungs (take in oxygen from the air and get rid of carbon dioxide) Liver (gets rid of toxins and controls blood sugar levels) Large Intestine (changes food waste into poo) Bladder (stores urine) Skin (protects the body from damage, infection and drying out) Heart (pumps blood around the body) Stomach (stores and digests food) Kidneys (make urine from waste products and excess water) Small Intestine (digests food and absorbs nutrients into the blood) Images ThinkStock
3 What are bones made from? Bones are hard on the outside. The outer part of the bone is made from a mineral called calcium and a fibre called collagen. This makes it strong and flexible. However, bones are not solid all the way through. Blood vessels and spongy bone can be found inside each bone. At the centre is a soft tissue called bone marrow. Bone marrow is extremely important because it stores fat and it also makes new blood cells to keep your body healthy. Hard Outer Bone Spongy Bone Blood Vessels Did you know? Bones are as strong as steel and they are also six times lighter. Marrow Teaching Packs - The Human Body - Page 7 Cross-section of a bone. Image ThinkStock
4 How does blood travel around the body? Your blood is pumped around your circulatory system many times each day. The heart propels the blood through the network of blood vessels (veins, arteries and capillaries), so that it can carry nutrients and oxygen around the body and back again. The heart is an extremely strong muscle that is constantly contracting. It has four different chambers. The two upper chambers squeeze blood into the two lower chambers, which then squeeze and push the blood out of the heart. The circulatory system includes the heart and blood vessels (veins, arteries and capillaries). Blood vessels called arteries carry blood away from the heart to the cells around the body. Veins carry blood back to the heart. Capillaries allow food and gases to move in and out of the blood. Teaching Packs - The Human Body - Page 17 The heart beats about 100,000 times each day! Images ThinkStock
5 How does skin sense touch and pain? There are millions of different sensors under the skin. Some sense light touch, heavy pressure, pain or temperature. The sensitivity of an area of skin depends on the number and type of sensors under the skin s surface. Fingers, for example, are full of light touch sensors. There are fewer light touch sensors in the arms, legs and back. Skin also contains pain receptors which generate a nervous impulse when we feel pain. These impulses are passed to the brain as well. Epidermis Hair Hair Follicle How does skin help to control the temperature of the body? Skin also plays an important role in controlling the body s temperature. When it is cold, the blood vessels near the surface of the skin constrict (narrow). This slows down the amount of blood circulating near the skin s surface and reduces the amount of heat that the body loses. This also causes the hairs in the skin to stand on end, forming goosebumps. When you shiver, your muscles release heat to warm you up. Sweat Gland Fat Tissue A cross-section of human skin. Blood Vessel Teaching Packs - The Human Body - Page 24 The opposite happens when the body is cold. The blood vessels near the surface dilate (get wider) causing more blood to circulate near the surface, so that more heat is lost. The action of sweating helps to cool the the body. As the sweat evaporates, it draws heat away from the skin. Image ThinkStock
6 Acidic A liquid that contains acid. Adolescence The time between childhood and adulthood (during the teenage years). Adulthood When our bodies are fully developed. Allergen A substance that can trigger an allergy (where the body s immune system might over-react). Alveoli A tiny air sac in the lungs that exchanges gas. Anatomy The structure of the body. Antioxidants A substance that reduces damage due to oxygen. Antibiotic A drug (created using live organisms) that kills bacteria. Antibody These are produced by white blood cells. They attach themselves to viruses, marking them as invaders. Antigen A marker on the surface of different bacteria, that the immune system recognises as foreign. Artery A blood vessel that carries oxygen-rich blood from the heart to the tissues. Asborb To take in or soak up. Baby A very young child. Bacteria A group of micro-organisms tat can cause diseases. Balanced Diet A healthy balance of food types that are all eaten in the right quantities. Beats The action of the heart, pumping blood around the body. Bile Fluid that supports digestion. It is produced by the liver and stored in the gall bladder. Bladder A sac in the abdomen that stores urine before it is removed from the body. Blood The red liquid that circulates in the arteries and veins of the body. Blood cells A type of cell normally found in the blood. Bloodstream The flowing blood in the circulatory system. Blood vessel A tube that carries blood (a vein, artery or capillary). Bone A piece of hard tissue that is part of the skeleton. Bone Marrow The soft tissue inside most bones. Brain The most complex organ on the planet, enabling us to think, feel, learn, move, see and more. Breath The air taken into or expelled from the lungs. Bronchi The branches of the windpipe inside the lungs. Calcium Used by the body to build teeth and bones. Cancer One of several different diseases, caused by cells dividing out of control. Canines Teeth that are used for stabbing and gripping food. Capillary A tiny blood vessel that allows food and gases to move in and out of the blood. Carbohydrates One of the types of nutrients in our food. Carbohydrates can be broken down into energy. Teaching Packs - The Human Body - Page 43
7 Can you write definitions for these words? blood ear drum exercise joint nose saliva skeleton tongue
8 Images: ThinkStock
9 Lungs Large spongy organs found in the chest. Oxygen passes into the blood here and carbon dioxide passes back out. Images: ThinkStock
10 Brain Controls all of the body s functions. Found in the head and protected by the skull. Images: ThinkStock
11 Thank you for looking at our preview resources. We hope that they are useful to you. Join us today to download thousands of resources from our popular Teaching Packs! Mark and Helen
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