Living SystemsFocus Question:What do living organisms need to survive?Lesson 1-1A
Needs of Living OrganismsWorld is full of living organismsPeople are alivePets are aliveTrees, grass, flowers, and insects in thecountry are aliveFish, whales, and kelp in the ocean arealiveMillions of tiny organisms livingeverywhere that are too small to seeLife is everywhere
Living organisms need things in orderto stay alive.What are some of the things that allorganisms need?Talk in your groups and make a list ofneeds shared by all organisms.
All living organisms need:WaterFoodGas exchange (inc. oxygen & carbondioxide)Waste disposal
AmoebaHave you ever heard of an amoeba?Amoebae are organisms. But they aredifferent from humans in many ways.They are tiny. Need a microscope to see asingle amoeba.They live in water.An amoeba is made of one cellAmoeba is an example of a single-celled organisms. Most of theorganisms on Earth are single-celledorganisms.
AmoebaSingle-celled organisms live their wholelives surrounded by water.Get food from the water around them.Use gases dissolved in the water.Eliminate their waste into the water aroundthem.They get everything they need for lifedirectly from their watery environment.Turn to page 85 in science textbook
AmoebaCell membrane surrounds the cell likeskin.Liquid cytoplasm fill the cell (mostlywater)
ElodeaLeaf of water plant – seen through amicroscopeMade of thousands of cellsEach cell looks like a green brickMulticellular organismMade of more than one cellLeaf is only two cells thick, so each cell istouching the waterCell membrane surrounds the cellCytoplasm fills the cellGreen chloroplasts contain chlorophyll
Human Cell ChallengeHumans are multicellular organisms.Don’t live in waterMade of trillions of cellsMost of the cells are deep inside ourmuscles, organs, and bones.But, every cell is alive.Every cell is receiving the resources itneeds to surviveFoodWaterGasesWaste Disposal
Human Cell ChallengeHow do human cells get the things theyneed to survive?How do they get food?How do they get water?How do they get oxygen?How do they get rid of waste?Talk in your groups – share your ideasabout the problem of providing for theneeds of the cells
InvestigationThat beating is called a pulseResult of blood being pushed through ablood vessel by the beating of your heartEvery time your heart beats, it pushes apulse of blood through the blood vesselsrunning through your body.Why is blood being pumped throughblood vessels all over your body?Ideas -
Circulatory SystemOpen textbook to page 86Pair/share readingAfter reading – complete notebooksheet “Circulatory System Review”Answer questions as best as you canbefore going back to the text to look upanswers.Modify our list of ideas, based oninformation from the reading.