Systems in Animals
Main Idea Different body systems help animals carry out basic life functions. Skeletal system Muscular system Nervous system Respiratory system Circulatory system Excretory system Digestive system
What is a system? A system is a group of parts, people, things that work together. Example: The school system. How does it work? For what we will be talking about is a system of body parts in an organism. Can you name a system in your body? Can you name a system that has nothing to do with science.?
Chapter Overview Animals have different organ systems. By the end of this chapter you will be able to answer these questions: How do animals move and sense changes? (Hint: 3 systems) How do air and blood travel in the body? (Hint: 3 systems) How food is broken down?(Hint: 1 system)
How do animals move and sense changes? Through these three systems: The Skeletal system /bones Muscular System /muscles Nervous System /nerves Animals use skeletal and muscular systems to move. The nervous system can sense and respond to changes.
How do air and blood travel in the body? Through these three systems: The Respiratory System / oxygen, lungs, breathing The Circulatory System / heart, blood, going through your body The Excretory System / removes waste, throws out the trash The circulatory and respiratory systems transports or moves blood and oxygen. The excretory system removes waste or throws out bad stuff for your body.
How is food broken down? Through this system: The Digestive System / food goes in, body takes the good stuff from the food, food goes out. The digestive system breaks down food so animals can get the energy they need.
The Skeletal System Bones made of living tissue Supports body (Helps you stand) Protects soft body organs (like a shield)
The Skeletal System
The Muscular System
The Muscular System Made of strong tissue called muscles. Vertebrates move when muscles shorten and pull on bones. Invertebrates move by tensing muscles and relaxing.
Nervous System Made of nerve cells The nerve cells join together to become nerves Controls all the body systems System has brain, nerves, spine
Nervous System
Respiratory System
Respiratory System Brings oxygen to the blood and removes waste gas. Small invertebrates do not have this! (ex: Worms) Lungs, gills
Circulatory System Move blood around body Carries oxygen, water, and food to blood cells. Heart, blood vessels, and blood Heart is made up of strong muscle tissue. Fish has 2 chambers in their heart Amphibians 3 chambers in their heart Mammals 4 chambers in our hearts.
Circulatory System
Excretory System Removes waste/ throw out trash Liver, kidney, bladder, skin, lungs a. Liver and kidney filter waste from the blood b. Skin sweats excess (too much) minerals c. lungs, gills remove waste gas
Excretory System
Digestive System Breaks down food Animals digest food in different ways a. Sponge turns food into tiny pieces (small particles) b. Simple invertebrates eat food and throws out waste from the same opening. c. Segmented worms eat in one hole and comes out of the tail. (2 openings)
Digestive System d. Reptile, amphibian have a more complex digestive system. e. Mammals also have a complex digestive system that breaks down food for the blood to take.
Digestive System