Cell Theory PDF

Cell Theory Have you ever wondered how cells were discovered and how they govern the mechanisms of our day-to-day activities? 2 2  One brick has no...but bricks, when significant purpose... combined together, become useful. 3 Similar to...

Cell Theory Have you ever wondered how cells were discovered and how they govern the mechanisms of our day-to-day activities? 2 2  One brick has no...but bricks, when significant purpose... combined together, become useful. 3 Similar to bricks, cells, when combined together, perform functions necessary for life. 4 Different scientists paved the way to propose theories about cells, the structural and functional unit of life. 5 5 How can one distinguish living organisms from nonliving entities? 6 Overview of the Cell Size of the cell as compared to other objects 7 General Functions of the Cell 8  General Functions of the Cell Regulation of the Homeostasis Internal Environment An organism’s ability to keep a Acquisition and constant internal state is called Utilization of Energy homeostasis. Responsiveness to Their Environment Maintenance of these conditions, is important because most cells of Protection and Support an organism require a specific set of conditions to function normally. 9  General Functions of the Cell Regulation of the Homeostasis Internal Environment Acquisition and Utilization of Energy Perspiration serve as the cooling system to remove excess heat in the body. Responsiveness to Their Environment Protection and Support Normal body temperature Shivering generates metabolic heat. 10  General Functions of the Cell Regulation of the Chemical Energy Internal Environment It is stored in the bonds present in Acquisition and Utilization of Energy food molecules, and it will be converted by the cells into more Responsiveness to Their Environment usable forms. Protection and Support 11  General Functions of the Cell Regulation of the Chemical Energy Internal Environment Energy is needed by various cells Acquisition and Utilization of Energy to perform their functions. ○ heart cells to pump blood Responsiveness to Their Environment ○ intestinal cells to digest food ○ skeletal cells to initiate motion Protection and Support ○ nerve cells to conduct information 12  General Functions of the Cell Regulation of the Responsiveness Internal Environment A cell must first be able to Acquisition and Utilization of Energy determine the changes that have taken place before Responsiveness to Their Environment deciding the necessary responses that will ultimately Protection and Support result in the maintenance of normal internal conditions. 13  General Functions of the Cell Regulation of the Responsiveness Internal Environment Acquisition and Utilization of Energy Responsiveness to Their Environment Protection and Support A tanned skin means more pigment is released in that area to impart protection to the underlying cells especially UV radiation that can damage DNA. 14  General Functions of the Cell Regulation of the Internal Environment Acquisition and Utilization of Energy Responsiveness to Their Environment Protection and Immune cells impart protection against Support pathogens and other foreign bodies that may enter the general circulation. 15  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Zacharias Janssen (1585–1632) invented the first primitive microscope. 16  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Robert Hooke (1635–1703) observed cork cells under a microscope. 17  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Francesco Redi (1626–1697) disproved the spontaneous generation theory. 18  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Anton van Leeuwenhoek (1632–1723) observed microorganisms by using his own practical microscope. 19  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Matthias Schleiden (1804–1881) proposed that all plants are composed of cells. 20  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Theodor Schwann (1810–1882) proposed that all animals are composed of cells. 21  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Rudolf Virchow (1821–1902) proposed that all cells come from pre-existing cells. 22 How do you think were the works of different scientists compiled and synthesized to develop the cell theory? 23  The Three Principles of Cell Theory Principle 1: Every living organism consists of one or more cells. Organism may be unicellular (left) or multicellular (right) based on their level of complexity. 24 The Three Principles of Cell Theory Principle 2: The cell is the fundamental unit of life. It is the smallest structural and functional unit in all organisms. 25  The Three Principles of Cell Theory Principle 3: Cells come from pre-existing cells. Cells contain hereditary material, which they pass to their daughter cells when they divide. 26 Which among the three principles of the cell theory can be practically applied in healthcare by promoting the use of sterilization and disinfection? Why do you think so? 27  Cells are generally small in size that they can only be viewed and magnified through the use of a microscope. Cells have a high surface area to volume ratio to ensure that they get adequate nutrients and to prevent a high concentration of wastes from accumulating. 28  Generally, cells function for support and protection, regulation of the internal environment, response to external stimuli, and acquisition and utilization of energy for cellular activities. Different scientists were involved in the development of the cell theory before it was finalized into three major statements. 29  The principles of the cell theory disproved the long-held belief of many scientists about the theory of spontaneous generation. 30 31 Below are five of the contributions to the development of the cell theory. Identify the scientist described in each of the following items. 1. He was the first to observe the cells under the microscope. 2. His experiment disproved the spontaneous generation theory. 3. He proposed that the cell is the basic unit of plants and animals. 32 Compare and contrast the theory of spontaneous generation from the principles of cell theory. Create a Venn diagram to show their similarities and differences. Provide two unique characteristics on each theory and one similarity. 33 Below are five of the contributions to the development of the cell theory. Identify the scientist described in each of the following items. 4. He stated in the cell theory that all organisms are made up of cells. 5. He proposed the idea in the cell theory that cells come from preexisting cells. 34 Lina, a teenager, observed one morning as she looked at the mirror that her face has a new pimple. She wondered how she got another pimple when she already pricked it a few days ago. What principle of the cell theory is related to this? 35