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Table of Contents: How cells make up an organisms body Consider this: What is a multicellular organism? What is a unicellular organism? Multicellular organisms.

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Presentation on theme: "Table of Contents: How cells make up an organisms body Consider this: What is a multicellular organism? What is a unicellular organism? Multicellular organisms."— Presentation transcript:

1 Table of Contents: How cells make up an organisms body Consider this: What is a multicellular organism? What is a unicellular organism? Multicellular organisms (like you) are made up of specialized cells & have levels of organization to their body.

2 There are 4 levels (after cells) to a multicellular organisms body: Tissue, Organs, Organ Systems, Organism ~ 1 st level (above cells) in plants/animals = Tissue- Specialized cells with similar structure & function form a tissue. 4 Types of Tissue in the Human Body 1)Epithelial tissue- contains cells that are tightly packed together. This is your outer layer of skin, lining of your air passage, and lines your internal organs. Protective. 2) Connective tissue- adds support & structure to the body, fills spaces, & stores fat. Blood, bone, cartilage, & fat cells all form connective tissue. Blood tissue connects all organs of the body! (squeeze top of outer ear to feel to feel cartilage) 3) Muscle tissue- like elastic. It’s job is to contract & relax. 3 types of Muscle Tissue: A) Skeletal muscle- moves bones of skeleton when brain tells it to B) Smooth muscle- involuntary movements, such as breathing C) Cardiac muscle- contracts to move blood around the body (heart) 4) Nerve tissue- found in the brain, spinal cord, nerves, & sensory receptors. Nerves send msgs to & from brain & spinal cord; some are controlled by brain, some that go thru spine are reflex (touch something hot-reflex thru spine to remove hand before msg gets to brain)

3 ~ 2 nd Level= Organs structure made up of at least 2 or more types of tissues that work together to perform a specific job in the body. There are many different organs in your body (Ex: liver, pancreas, stomach, heart, lungs, brain, etc.). Each organ has its own jobs and the tissues that form it work together to get the job done (ex: digestive system). Many organs are made of all 4 of the main types of tissues (Ex: eyes are covered by epithelial tissue, have connective tissue for support & structure, nerve tissue to deliver msgs, and muscles to move around.) Instant Lab: Jump Rope! (Labs/Activities Section of Notebook) ~ Jump rope for 1 minute. When you stop, make a list of the organs you can feel working in your body. Compare to others in your class. What organs are working when you exercise?

4 ~ 3 rd Level = Organ Systems- group of organs that work together to perform a specific function. There are 9 Organ Systems in the Body 1) Digestive System- processes everything you eat. Teeth, tongue, saliva begin to break food down, then muscles pass food down the esophagus to stomach which squeezes & breaks food into smaller pieces. Stomach acid/enzymes turn food into creamy liquid which enters the small intestine, the waste or parts of food the body can’t use is sent to large intestine where eventually waste is eliminated/passed. 2) Respiratory system- Gets us clean oxygen, releases CO2. Uses diaphragm, nose/mouth, trachea, lungs 3) Circulatory system- all cells need oxygen, carries nutrients and oxygen-rich blood to cells 4) & 5) Skeletal & Muscular systems- work together to provide support & movement to the body 6) Integumentary system- skin, hair, nails which cover & protect the body 7) Excretory system- Removes waste from blood 8) Reproductive system- produces new generations of individuals 9) Endocrine system- makes & sends chemicals (hormones) to help control body activities Plants have: Root system- anchors plant in ground, absorbs nutrients/water & moves them thru plant, can also store food. Shoot System- stems and leaves. Stems support the plant and have tubes for carrying water, nutrients, minerals to all parts of plant (what branches/leaf/flower grow from). Leaves make food.

5 ~4 th Level- the Organism- a complete living thing that relies on cells for life functions (you/dog/cat/tree).  All the previous levels mentioned make an Organism and each system needs the help of the other systems/levels to work at its best. If one system fails to do its job the entire organism is affected.

6 THE END!!!! Lesson 1.2 Review Questions: 11 Points 1.What tissue connects all the organs of the body? 2.What is an organ system? Name 3 organ systems of the body. 3.Name the 2 organ systems of plants. 4.What are the 4 levels (after cells) that make up multicellular organisms (like you!)?


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