7 th Grade Science. Living Systems Every living thing has parts that work together.Every living...
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Transcript of 7 th Grade Science. Living Systems Every living thing has parts that work together.Every living...
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7th Grade Science
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Living Systems
• Every living thing has parts that work together.
• From cells to organs, each part of the system has a job.
• The parts are called structures, and the kinds of work they do are called functions.
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What is a Living System?
• All living systems are made up of cells, the basic unit of life.
• Many cells working together at the same job form tissues.
• Different tissues work together to form organs.
• Organs work together to form organ systems.
• Organ systems work together in the body or larger organism.
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The Structure of Life• Each organism has unique structures suited to its particular way of life.
• Different organisms may use similar and different structures to do the same job.
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Structure and Function• For example, tiny hair-
like cilia surround the microscopic organism known as a paramecium. The cilia move back-and-forth like the oars of a boat to move the paramecium through water.
• Can you think of an organism that has similar methods of movement?
• .
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CELLS• A cell is the basic
unit of structure and function of life.
• A cell is a living unit.
• Cells make up living things and carry out the activities that keep a living thing alive.
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CELLS• Cells have different sizes and shapes, based
on their JOB• Some can be very SMALL and some can be
very LARGE
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Brainpop—Cell Specialization
1. What kind of cells are humans made of: prokaryotic or eukaryotic?
2. Which organelle gives plant cells their green color?
3. How long are the LONGEST nerve cells?
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TISSUES• Tissues are composed of many cells working
together to do the same function.
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4 Tissue Types of Animals
Epithelial
Covers the outside of the body and lines inner surfaces of the body.Forms glands
Found in your skin
Connective
Fills in spaces and connects other tissues together; supports, protects, nourishes,and insulates organs.
Found in ligaments, cartilage, blood
MuscularContracts and relaxes to allow movement; makes up some organs.
Found in your diaphragm, heart, biceps, triceps
NervousTransmits messages through the body.
Found in your brain, spinal cord, nerves
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4 Tissue Types of Animals
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ORGANS• Organs are structures that are composed of
two or more different types of tissues. • They have specific functions and have
recognizable shapes. • Examples of organs are: Stomach, Liver,
Heart, Lungs, and Brain
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Organs make up Organ Systems• Organs systems consist of related organs
that have a common function.
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Organs make up Organ Systems
Organ System Function
Skeletal Supports the body
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Organs make up Organ Systems
Organ System Function
Muscular Makes the body move
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Organs make up Organ Systems
Organ System Function
Digestive* Breaks down food and takes in nutrients
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Organs make up Organ Systems
Organ System Function
Immune Protects the body from infection and fights disease
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Organs make up Organ Systems
Organ System Function
Circulatory*
Carries oxygen and nutrients to cells as well as picks up carbon dioxide from the body
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Organs make up Organ Systems
Organ System Function
Respiratory*
Takes in oxygen from air and releases carbon dioxide from the body
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Organs make up Organ Systems
Organ System Function
Nervous Controls body activities through the brain, spine and nerves
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Organs make up Organ Systems
Organ System Function
Excretory Removes wastes
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Organs make up Organ Systems
Organ System Function
Endocrine Controls body activities through hormones
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Organs make up Organ Systems
Organ System Function
Reproductive
Allows individuals to reproduce
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Organs make up Organ Systems
*These systems will be studied in our next units on the Human Body*These systems will be studied in our next units on the Human Body*These systems will be studied in our next units on the Human Body
*Asterisked Units:These systems will be studied in our next units on the Human Body
Organ Systems working together make up Living Systems like you.