Chemistry

    Skeletal system   The human  skeletal system  consists of all of the bones, cartilage, tendons, and ligaments in the body.     The  skeletal system  includes all of the bones and joints in the body. Humans are vertebrates, animals having a vertebral column or backbone. Muscular system   The muscular system is  composed of specialized cells called muscle. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. The  muscular system  is responsible for the movement of the human body. Attached to the bones of the skeletal system .                  

  Plant Oil Chapter#14 Oils in plants: Like animals, plants also store excess energy they take in as chemical energy in fats. The fats in plants are often liquids at 20 o C so we call them oils. Extracting the oil from plants: In order to get the oil from a plant, we have to break open its cells to release it. There are two main ways to break down the cell walls: Pressing (applying pressure) Distillation (heat using steam) Then water and other impurities are removed. Pressing: ´   In this method we squash the plant material. Then we collect the liquid. The oil and the water-based solutions are immiscible. ´   They do not dissolve in each other and will separate out into two layers. ´   Then the oil and water are separated by centrifuging (spinning the mixture at high speeds) or just by decanting (pouring off). Distillation: To extract plant oils we can either: ´   Boil up the plant material with water, or ´   P...

  Symmetrical: A shape has symmetry if a central dividing line (a mirror line) can be drawn on it, to show that both sides of the shape are exactly the same. Asymmetrical: The meaning of  ASYMMETRICAL  is having two sides or halves that are not the same, not symmetrical.  Having parts that fail to correspond to one another in shape, size, or arrangement Bilateral symmetry: Bilateral symmetry  refers to organisms with body shapes that are mirror images along a midline.