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Transcript
Organization of life Aseel Samaro Cells: Starting out small Most cells are too small to be seen without a microscope. Do you know what is the world’s largest cell ? Cells The first cell of a chicken is yellow with a tiny white dot in it It is surrounded by clear, jellylike fluid called egg white The white dots divides over and over again to from a chick. The yellow yolk (from the first cell) and the egg white provides nutrients for the developing chick’s cell Cells Not all your cells look or act the same. We have about 200 different kinds of cells Each type is specialized to do a particular job Bone cells Blood cells Skin cells Tissues: Cells working in Teams Cells are grouped together to make a tissue that has function. A group of cells of the same type which are performing the same function is called ________ An example of tissue is muscle, which contracts to allow movement of the body Different types of tissues work together to form an organ Tissues: Cells working in Teams Organs: Teams working together When two or more tissues work together to do a specific job, the group of tissues is called an ________ Organs are made from different tissues which are coordinated to work together. Some examples of organs: Stomach Heart Lung A leaf is a plant organ What is the largest organ in the human being? Organ System: a Great combination Organs work together as organ systems. Each system has a specific job to do in the body The digestive system which enables to breakdown food into very small particles is made up of many different organs such as: Pancreas Stomach Liver Each organ in the digestive system has a job to do. A particular organ is able to do its job because of the different tissue within it. Organ System: a Great combination The organs in an organ system depend on each other. If any part of the system fails, the whole system is affected Failure of one organ system can affect other organ systems. Think of what would happen if your digestive system stopped converting food to energy Organism: Independent Living Anything that can live on its own is called an organism. All organism are made up of a least one cell. If a single cell is living on it own it is called unicellular YOU ARE A MULTICELLULAR ORGANISM Time For Some Activities (10 Minutes) Write the following heading on the top of their notebooks and list two examples of each heading Cell Tissue Organ Organ system Give more examples about organ systems What are these organ system made of ? Respiratory system It is a biological system consisting of specific organs and structures used for the process of respiration in an organism. The respiratory system is involved in the intake and exchange of oxygen and carbon dioxide between an organism and the environment. Digestive system It is a group of organs working together to convert food into energy and basic nutrients to feed the entire body Nervous system It is a complex network of nerves and cells that carry messages to and from the brain and spinal cord to various parts of the body. Circulatory system The system that moves blood throughout the body. It is responsible for the flow of blood, nutrients, oxygen and other gases, and hormones to and from cells Conclusion We can think of a human body as being made up of different systems. Each system has a specific purpose in the body. E.g: circulatory system that pumps blood around our body