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Multicellular Organisms

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- Multicellular organisms are made of multiple cells working together.
- Groups of cells form tissues that are specialized for certain functions.
- Body systems work together to help us survive.
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Discussion Questions
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Before VideoWhat are some examples of organs we might find in animals? ANSWER
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Brain, heart, liver, lungs, kidney
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Roots, stem, leaves, pistol
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Yes, all animals have a nervous system of some kind. The nervous system includes the brain, and the brain allows you to see, touch, taste, smell, and hear things.
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Animals have blood vessels and veins. Plants also have veins, but their veins carry water and animal veins carry blood.
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Multicellular organisms are living things that are made up of many cells. [Accept any examples of multicellular organisms.]
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Multicellular organisms need food and water to stay alive. They also need the various parts of their body to work together to keep them healthy.
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After VideoHow do the various parts of the body work together when we eat something?ANSWER
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When we eat something, food travels through our digestive system, which includes our mouth, stomach, intestines, and other organs. After food is digested, our bodies use it for energy and to help us stay healthy. We eliminate food we don’t need as waste through our excretory system.
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Plants have different parts that need to work together, but they are different from animal parts. Plants get their energy and make their food using the Sun, and animals need to eat to get energy.
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Our body is made of cells, cells work together to form tissue, tissues make up organs, organs make up our body’s subsystems, and all the subsystems work together to keep our body system alive and healthy.
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Our sense receptors are found in our eyes, ears, tongue, skin, and nose. We need sense receptors for our various senses to work. They are also part of the nervous system.
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I think we take medicine, like aspirin, to trick out nerves into not feeling pain.
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The nervous system was also affected because the electrode was on the skin, so I think the impulse traveled through the nerves on our skin to the muscle to make it move.
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Vocabulary
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Multicellular
DEFINE
Made of many cells.
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Unicellular
DEFINE
Made of one cell.
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Tissue
DEFINE
Groups of specialized cells that work together.
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Xylem
DEFINE
Plant tissue that brings water and dissolved nutrients up from the plant roots and helps to form the woody stem.
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Organ
DEFINE
A group of different tissues that work together to perform a specific function (e.g., heart, stomach, and kidney).
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System
DEFINE
Organs and tissue working together to perform a function (e.g., digestive system and nervous system).
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Brain
DEFINE
The central organ of the nervous system.
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Sense Receptors
DEFINE
Specialized cells that allow for the detection of sound, light, taste, touch, and smell.
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Blood Vessels
DEFINE
Tube-like structures that carry blood throughout an organism.
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Villi
DEFINE
Hair-like projections found in the small intestines (digestive system) that help absorb nutrients.
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Multicellular
DEFINE
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Reading Material
Download as PDF Download PDF View as Separate PageWHAT ARE MULTICELLULAR ORGANISMSPlants and animals rely on their various components to work together in order to maintain health and survive. Different multicellular organisms are made of different systems, but all systems are organized in the same way. Living systems are interdependent. One system not functioning normally will affect the other systems in some way.
To better understand Multicellular Organisms…
WHAT ARE MULTICELLULAR ORGANISMS. Plants and animals rely on their various components to work together in order to maintain health and survive. Different multicellular organisms are made of different systems, but all systems are organized in the same way. Living systems are interdependent. One system not functioning normally will affect the other systems in some way. To better understand Multicellular Organisms…LET’S BREAK IT DOWN!
Systematic Origination
Whether you are investigating a plant or animal system, multicellular organisms are all organized the same way. Body systems can be broken down into components called organs, organs are made of different kinds of tissue, and tissue is made from groups of specialized cells.
Systematic Origination Whether you are investigating a plant or animal system, multicellular organisms are all organized the same way. Body systems can be broken down into components called organs, organs are made of different kinds of tissue, and tissue is made from groups of specialized cells.Animal Systems
Animals rely on several different systems to survive. These systems work together to allow blood to flow, eat and digest food, and move around. Some of the major systems in animals are nervous, digestive, circulatory, respiratory, excretory, muscular, and skeletal. But some animals, like humans, also have other smaller systems that help them too.
Animal Systems Animals rely on several different systems to survive. These systems work together to allow blood to flow, eat and digest food, and move around. Some of the major systems in animals are nervous, digestive, circulatory, respiratory, excretory, muscular, and skeletal. But some animals, like humans, also have other smaller systems that help them too.Plant System
Plants rely on systems to survive. These systems work together to allow the plant to make food, to allow water to travel throughout the plant, and to help the plant reproduce. Plants also have organs such as roots, stems, and leaves. But unlike animals, plants have only two major systems: the root system and the shoot system.
Plant System Plants rely on systems to survive. These systems work together to allow the plant to make food, to allow water to travel throughout the plant, and to help the plant reproduce. Plants also have organs such as roots, stems, and leaves. But unlike animals, plants have only two major systems: the root system and the shoot system.System Interdependence
Systems depend on each other to function normally. For example, the respiratory system brings oxygen into the body, and the circulatory system moves oxygen throughout the body. When systems work together like they should, plants and animals are able to grow and reproduce. If one system is not functioning normally, it can affect other systems. For example, wearing a cast to heal a broken bone will affect how you can use your muscles.
System Interdependence Systems depend on each other to function normally. For example, the respiratory system brings oxygen into the body, and the circulatory system moves oxygen throughout the body. When systems work together like they should, plants and animals are able to grow and reproduce. If one system is not functioning normally, it can affect other systems. For example, wearing a cast to heal a broken bone will affect how you can use your muscles.Doctors Who Specialize in Treating Body Systems
Doctors who focus on figuring out and treating a single system are called specialists. For example, a neurologist studies the nervous system, and a gastroenterologist focuses on the digestive system. The medical field has many specialized disciplines. There are even doctors who study only special parts of certain systems, such as hematologists who study the cause, treatment, and prevention of diseases that are related to blood.
Doctors Who Specialize in Treating Body Systems Doctors who focus on figuring out and treating a single system are called specialists. For example, a neurologist studies the nervous system, and a gastroenterologist focuses on the digestive system. The medical field has many specialized disciplines. There are even doctors who study only special parts of certain systems, such as hematologists who study the cause, treatment, and prevention of diseases that are related to blood. -
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How are cells, tissues, organs and body systems related?
Explain how one body system not functioning properly can affect another body system.
Explain how two or more of your body systems work together to perform a task such as running.

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