Biology add pt1 no2

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  • Biology Add Pt1
    • Plant tissues and organs
      • The organs in a plant are made up of tissues
      • The whole plant is covered in a layer of epidermis.
        • This helps to protect the underlying cells
          • It stops the leaves from losing too much water
          • It prevents pathogens from entering the plant
      • Most of the cells in a leaf are mesophyll cells
        • This is where photosynthesis takes place
      • Xylem and Phloem tubes run through the entire plants
        • These are tubes which make up the plants transport system
          • Xylem carries water from the roots to the leaves
          • Sugars are transported around the plant in Pholem
      • Plant organs include roots, stem, flowers and leaves
        • Each is made up of tissues such as Mesophyll, Xylem and Phloem
      • Leaf epidermis
        • The epidermal tissue on the lower surface of the leaf has little holes called Stomata
          • These allow gases to diffuse into and out of the leaf
    • Animal tissues and organs
      • Functions of the digestive system
        • A system is a group of organs that performs a particular function
        • The function of the digestive system is to break down the food you eat so the food molecules can enter the blood
        • Salivary glands
          • They secrete a digestive juice called salvia
            • Salvia contains enzymes that break down starch in the food
        • Pancreas
          • This secretes pancreatic juice
            • This contains more enzymes that break down starch, protein and fats in the food
        • Small intestine
          • Where the enzymes from the pancreas work
            • After they have digested the food and broken it down to small, soluble molecules
              • These seep through the wall of the intestine into the blood, along with most of the water in the food
                • This is called absorption
        • Large intestine
          • Undigested food passes through on its way to the outside world as faeces
            • As food moves through here, more water is absorbed from it
        • A group of cells is called a tissue
        • Organs are made up of different types of tissues
        • The heart contains muscle tissue that can contract and relax
          • Nervous tissue to control the heart beats, and ligaments to hold the different tissues in place
      • Protecting the digestive system
        • The whole  of the digestive system is lined with epithelial tissue to protect the cells in the organs from digestive juices which could break them down


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