animal systems
DESCRIPTION
Sixth gradeTRANSCRIPT
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Animal Systems
Science 6Mrs. Marlene Torres
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In order to release the energy stored in food, all animals perform:
Animals need to obtain or ingest food from their
environments
•Digestion
•Respiration
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Digestion is the process in which food is broken down into molecules that can be use by cells.
Digestion
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Invertebrates have simple digestive systems. They can either:
Filter food Have one opening -(to move food in and wastes out)
Have 2 openings (“tube within a tube”)
-one to move food in, other to move wastes out
Digestion in Invertebrates
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Digestion in Invertebrates
Sponges belong to phylum Porifera
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Flatworms (Example: Planaria)
Digestion in Invertebrates
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“Tube within a tube” system – 2 openings
◦Example: Segmented worms-Earthworm
Digestion in Invertebrates
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Vertebrates have complex digestive systems.
They have many organs with different functions like crush, digest, absorb nutrients and water to obtain the energy from food.
Digestion in Vertebrates
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Digestion in Vertebrates
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Digestion in Vertebrates
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Digestion in Vertebrates
Frogs
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Digestion in Vertebrates
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Digestion in Vertebrates
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Excretion is the removal of wastes from the body.
Wastes have no value and may be poisonous to cells.
Examples of wastes produced by animals:
Carbon dioxide Salt excess Wastes from undigested food Urine
Excretion
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The removal of wastes is performed by many systems (or organs):
◦Digestive System – eliminates the
undigested with wastes
◦Respiratory system – eliminates
carbon dioxide
◦Skin – eliminates salt excess and
water
Excretion
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Invertebrates Vertebrates
Some eliminate wastes through pores (Ex. Sponges)
Have an opening in their bodies to
excrete or eliminate wastes.
Others eliminate wastes through the same opening where food enters the body.
Some eliminates wastes through a second opening design for this purpose.
Excretion
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Digestion itself, can not release the energy from the food molecules. It only brakes down large food molecules into smaller ones.
Respiration is the process of releasing energy from food molecules in presence of oxygen. It occurs inside the cell.
Respiration
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Breathing is the action of moving air to the inside of the body and then, move air outside.
In other words, inhale and exhale.
Breathing provide the oxygen needed for respiration.
Breathing
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The exchange of gases during respiration occurs by DIFFUSION.
Diffusion refers to the movement of molecules from areas of higher concentration to areas of lower concentration.
Respiration in Invertebrates
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Diffusion If more oxygen can be found outside of an organism, it will move to the inside of the organism, where oxygen is found in lower concentration.
The same situation occurs inside of the body around the cells.
Respiration in Invertebrates
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Respiration occurs by diffusion. Example of some invertebrates:
◦Flatworms and Round worms◦segmented worms◦Snails◦ Slugs
This is the reason why they need to stay in moist environments.
Respiration in Invertebrates
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Invertebrates like mollusk, crustaceans and some worms, also have gills with blood vessels near the surface.
Other invertebrates have “book lungs”, a structure very similar to gills. Can be found in most arachnids.
A trachea can be found in insects and most spiders to provide oxygen-rich air to the insect’s cells.
Respiration in Invertebrates
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Flea respiratory
system have atrachea, whichconsist ofbranching tubesthat connects to all insect’s cells.
Respiration in Invertebrates
Flea
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In vertebrates we can found gills and lungs, to provide the oxygen that will enter into each cell by diffusion.
Fishes have gills.
Amphibians are the only vertebrates that begins their life with gills, and develop lungs as adults BUT continue to exchange gases through their skin.
Respiration in Vertebrates
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Cartilaginous fishes
Respiration in Vertebrates
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Only BIRDS, REPTILES and MAMMALS use lungs exclusively for respiration.
Respiration in Vertebrates
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Respiratory
system
(Example of
mammals –
humans)
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Remember:The digestive andrespiratory systemswork as a team toprovide the foodmolecules andoxygen needed bythe cell to produceenergy.
They can do it withthe help of the Circulatory system.
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The movement of important materials such as oxygen, glucose, and wastes throughout the body.
REMEMBER: Glucose is the simplest form of sugar, and the “food” need by the cell to carry out respiration.
Circulation
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Invertebrates Vertebrates
Some have an open circulatory system, where blood moves into smaller vessels and then is released by the heart directly to the tissues.
We can found both systems; some vertebrates like fishes, have an open circulatory system. While reptiles
Others have a closed circulatory system, where blood travels all the body within blood vessels.
Circulation
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Circulation
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Cold-blooded animals◦The body temperature in cold-blooded animals changes with its environment.
◦Examples: Amphibians Reptiles Most fishes
Body Temperature
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Warm-blooded animals◦The body temperature in warm-blooded
animals stays the same, no matter what happens with the temperature of the air.
◦If the temperature become to hot, warm-blooded animals give off the excess heat perspiring or sweating.
◦In cold climates, we found thick layers of blubber to keep heat from escaping the body. Ex. Whales
Body Temperature
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There are three basic design that provide support and movement to animals:1. Hydrostatic skeleton
(hydroskeleton) 2. Exoskeleton 3. Endoskeleton
Support and Movement
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Skeletons
.