Science Revision

• Diaphragm: Muscle under the lungs . Pulls the air into the lungs.
• Lungs: Organs that take oxygen from the air we breathe
• Bronchioles: Small tubes that carry air to the alveoli
• Trachea: Windpipe, carries air to the lungs
• Alveoli: Small sacs where gas exchange takes place between blood and air
• 3 ways alveoli are adapted for there function are: large surface area, thin walls and good blood supply.
• Equipment needed to measure the temperature rise is a thermometer.
• When we inhale the muscles are contracting. The muscle between your rib cage contract which pulls your rib cage up and out and the diaphragm contracts downwards. This increase the volume inside the chest. The pressure inside the chest decreases so air is drawn into the lung.
• Nitrogen: 78%. Oxygen: 21%. Carbon dioxide: 0.04%.
• 3 greenhouse gases: Methane, carbon dioxide, water vapour.
• Electrolysis is more reactive than carbon.
• Recycling: processing a material so that it can be used again. E.g. metal, plastic, glass.
• Calculate upthrust: difference between them.
• Force applied 👇👆Reaction force.
• Pressure = Force/Area
• Describe the movement of gases through the alveoli: Oxygen diffuses into blood stream. Carbon dioxide diffused out the blood stream and into lungs.
• Atmosphere: The gases that surround the Earth and make up the air.
• Carbon cycle: is the processes by which carbon is naturally transferred to different stores through a range of natural processes.
• Linear line: Force is directly proportional to extension.
• Non linear line: A line that is not straight, but has a curved shape.
• What happens when you sit on a chair:

  • You compress the bonds when you exert a force.
  • Your weight pushes the particles together.
  • The bonds are compresses.
  • They push back and support you.
• What is the role of the digestive system: Break down food into smaller molecules so that they can be absorbed into the blood and travel to cells to be used.
• Takes 12 hours for all the nutrients to be absorbed.
• The large intestines main job is to absorb water.
• A bile comes from the liver.
• The intestines are lined with villi they increase the surface area.
• Stomach: A bag of muscle, and organ that squeezes and breaks down the food.
• • Digestive enzymes convert food into small soluble molecules that can be absorbed into the blood stream of the small intestine.
  • Molecule too large can’t be absorbed.
  • Only small molecules can be absorbed as many of the food we eat too large and insoluble to be absorbed into the blood.
• Liver: Makes bile which helps break down fats.
• Atom: The smallest part of any element.
• Testes: Where the sperm cells are made.
• Ovary: Where the egg cells are made.
• Gestation: The time of development of a fetus in the uterus from fertilisation.
• Sperm can live in the uterus for up to 5 days.
• Illegal to kill a fetus in the womb after 24 weeks.
• Placenta: Supplies nutrients, exchanges gases and gets rid of waste products.
• Fluid sac: Acts as a shock absorb to protect baby from bumps.
• • Male sex cells are called sperms
  • Female sex cells are called eggs
  • Both are called gametes
• A compound is when the different atoms are joined or linked together.
• 118 element is the periodic table.