Living Systems

Focus Question:

What do living organisms need to survive?

Lesson 1-1A

Needs of Living OrganismsWorld is full of living organisms

People are alive

Pets are alive

Trees, grass, flowers, and insects in the country are alive

Fish, whales, and kelp in the ocean are alive

Millions of tiny organisms living everywhere that are too small to see

Life is everywhere

Living organisms need things in order to stay alive.

What are some of the things that all organisms need?

Talk in your groups and make a list of needs shared by all organisms.

All living organisms need:

Water

Food

Gas exchange (inc. oxygen & carbon dioxide)

Waste disposal

AmoebaHave you ever heard of an amoeba?

Amoebae are organisms. But they are different from humans in many ways.

They are tiny. Need a microscope to see a single amoeba.

They live in water.

An amoeba is made of one cell

Amoeba is an example of a single-celled organisms. Most of the organisms on Earth are single-celled organisms.

AmoebaSingle-celled organisms live their whole lives surrounded by water.

Get food from the water around them.

Use gases dissolved in the water.

Eliminate their waste into the water around them.

They get everything they need for life directly from their watery environment.

Turn to page 85 in science textbook

AmoebaCell membrane surrounds the cell like skin.

Liquid cytoplasm fill the cell (mostly water)

ElodeaLeaf of water plant – seen through a microscope

Made of thousands of cells

Each cell looks like a green brick

Multicellular organismMade of more than one cell

Leaf is only two cells thick, so each cell is touching the water

Cell membrane surrounds the cell

Cytoplasm fills the cell

Green chloroplasts contain chlorophyll

Human Cell ChallengeHumans are multicellular organisms.

Don’t live in water

Made of trillions of cells

Most of the cells are deep inside our muscles, organs, and bones.

But, every cell is alive.

Every cell is receiving the resources it needs to survive

Food

Water

Gases

Waste Disposal

Human Cell ChallengeHow do human cells get the things they need 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 ideas about the problem of providing for the needs of the cells

InvestigationThat beating is called a pulse

Result of blood being pushed through a blood vessel by the beating of your heart

Every time your heart beats, it pushes a pulse of blood through the blood vessels running through your body.

Why is blood being pumped through blood vessels all over your body?

Ideas

Circulatory System

Open textbook to page 86

Pair/share reading

After reading – complete notebook sheet “Circulatory System Review”

Answer questions as best as you can before going back to the text to look up answers.

Modify our list of ideas, based on information from the reading.

Vocabulary

Cell - the basic unit of life

Oxygen - an atmospheric gas needed by most living cells

Carbon dioxide - a waste gas produced by living cells

Circulatory System ReviewWhat are the basic needs of all living cells?

How do the cells in multicellular organisms get the resources they need to stay alive?

What is the main function of the left side of the human heart?

What is the main function of the right side of the human heart?

What is the function of the red blood cells?

What are the main kinds of blood vessels and what functions do they perform?

Describe what happens when blood flows through the lungs.

Describe what happens when blood in capillaries flows past cells.

Circulatory and Respiratory Systems Video

Watch & listen for information that confirms what you know about the circulatory system and how it interacts with the respiratory system.

Think about how the new information relates to the big idea of the circulatory system, which provides life support for cells.

Video QuestionsWhat happens to heart rate during exercise?

Why does that happen?

How does this help cells in the body?

What happens when a blood vessel is cut?

How does this help cells in the body?

What other kinds of cells are in the blood and what do they do?

VocabularyHeart - a muscular organ that contracts rhythmically, producing a pulse with each contraction

Blood - a liquid tissue that flows to and from cells in blood vessels called arteries, veins, and capillaries

Arteries - carry blood away from the heart to the body

Veins - carry blood from the body to the heart

Capillaries - connect arteries and veins. Gases, nutrients, and wastes are exchanged between capillaries and cellsFour chambers of the human heart - right atrium, right ventricle, left atrium, and left ventricleCirculatory system - includes tissues (blood and blood vessels) and organs (heart) that transport life-support substances to cells and removes waste

Lung - organ in animals where gases, such as oxygen and carbon dioxide, pass between the atmosphere and the bloodRespiratory system - includes tissues and organs (lungs) that provide gas exchange between the blood and atmosphereTissue - a group of similar cells working together to perform a function

ContentWhat do cells need to stay alive?

Cells need water, food, oxygen, and waste disposal to stay alive.

Content

How do cells get the things they need to survive?Cells get the things they need to survive by the circulatory system which delivers water, sugar, and oxygen to cells and carries waste carbon dioxide away from cells.

ContentWhat is the general path taken by blood through the circulatory system?

The path the blood flows through the circulatory system is: from the body to the right atrium of the heart, to the right ventricles, to the lungs, to the left atrium, to the left ventricle, into arteries that flow into capillaries, which are in contact with cells. Blood returns to the heart in veins.

Your questions?