1 / 32

Homeostasis

Homeostasis. By: Sarah Berger and Shay Dite. What is Homeostasis?. Homeostasis is the maintenance of a stable environment. It prevents us from getting sick all the time. It keeps us warm in cold temperature. It maintains species.

emerson-carlson
Télécharger la présentation

Homeostasis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Homeostasis By: Sarah Berger and Shay Dite

  2. What is Homeostasis? • Homeostasis is the maintenance of a stable environment. • It prevents us from getting sick all the time. • It keeps us warm in cold temperature. • It maintains species. • Homeostasis is necessary in the smallest single cell organisms, to the biggest whale.

  3. Why is Homeostasis Important? • Without it, waste wouldn’t be removed, • Nutrients wouldn’t be delivered, • Oxygen wouldn’t be received, • Our temperature would be abnormal, • pH levels wouldn’t regulate. • Without homeostasis, nothing would live.

  4. Cellular Homeostasis • Cells maintain homeostasis. • Cellular homeostasis means that everything in the cell is working properly. • The cell membrane is the main aspect to this conjecture. • A membrane keeps the organelles safe and separate from the external world. • The stuff inside a cell is much different from the things outside the cell. • If a cell intakes something it shouldn’t it could very well die.

  5. Cellular Homeostasis (Cont.) • Sometimes cells have an unnecessary particle or molecule in them. • Sometimes there is a molecule they need right outside the membrane. • That is why cells use diffusion. It gets rid of the unwanted particles and intakes the wanted ones.

  6. Cellular Homeostasis (Cont.) • Occasionally cells have too much water in them, if that occurs in excess, the cell can rupture and die. • Sometimes cells don’t have enough water. • That is why the use osmosis –the passing of water through a membrane. • Osmosis and diffusion regulate the amount of substances in a cell.

  7. Hierarchy of Organization • The smallest thing able to function on its own is a cell, then: • Tissue • Organ • System • Organism

  8. Working Together • Cells work together to form tissues, which work together to form organs, to form systems, which work together to help maintain homeostasis in an organism. • Everything needs to work together and communicate in order to make life.

  9. How Homeostasis Works: • There are receptors all over living things. • Receptors monitor the condition of our beings. They detect if we are cold or if we are getting too much light into our eyes. • Receptors can be our five senses, sight, taste, hearing, touch, and smell, or they can be internal sensory organs.

  10. How it Works: • The receptors give the information to the control center. • The control center can be the brain or the nucleus. • It then tells the body what to do in response to the information received.

  11. How it Works (Cont.): • The control center gives the effectors directions. • The effectors are the multiple organ systems we have. • The effectors then execute the order, in hopes of fixing the issue.

  12. Additional Terms • Feedforward: term for what happens while waiting for a change. • Feedback: the actions made when a change has been discovered. • Negative Feedback loop: A way of communication to maintain homeostasis –receptors to the control center to the effectors. • A negative feedback loop is basically what homeostasis is.

  13. Negative Feedback Loop • Without this process, homeostasis wouldn’t be existent. • An example is of heating a house: • The thermometer (receptor) detects that the house is cold. • It gives that information to the thermostat which tells the furnace to turn on.

  14. Negative Feedback Loop • Here is an example in animals: • A person walks from a dark room to a light-filled room. • The eye is in taking too much light (reception). • The brain tells the pupils to shrink. • The pupils shrink, letting the correct amount of light into the eyes.

  15. Negative Feedback Loop

  16. Positive Feedback • In addition to negative feedback, it can be positive. • Positive feedback is when something doesn’t make a loop, but enhances the change. • When a baby is being born, the uterus is stretched. Instead of putting it back to its regular form, a positive feedback loop makes the uterus stretch farther.

  17. Positive Feedback Loop

  18. Homeostasis • Homeostasis can be disrupted by: • A change in temperature • Internally and in the environment • Lack of Oxygen • Pathogens • Toxins • Change in blood pressure • Physical and psychological distresses

  19. Homeostatic Controls • There are two control systems for homeostasis. • They are intrinsic and extrinsic. • Intrinsic are the controls inside an organ. • Extrinsic are the controls outside an organ.

  20. Body Systems • All the body systems work together to maintain homeostasis. • Some have more importance in maintaining things though. • The nervous system is probably the most important closely followed by the endocrine system.

  21. The Nervous System • The nervous system controls the actions of the other systems. • It also detects changes in the body.

  22. The Endocrine System • It secretes hormones which regulate many changes within the body.

  23. Muscular System • The muscular system helps the body to move which can affect the heat. • It also helps maintain the structure of the organism.

  24. Skeletal System • It maintains the body’s structure. • Muscles attach to it. • The bones store many minerals and are full of blood vessels.

  25. Integumentary System • This system, the skin system acts like a cell membrane. It keeps unwanted things out and water in.

  26. Respiratory System • This system gets oxygen to everything that needs it. • It also removes carbon dioxide from the body.

  27. Digestive System • The digestive system intakes and absorbs nutrients for the whole body. • It gets rid of the unwanted waste.

  28. Circulatory System • This system transports many things such as: • Oxygen • Carbon Dioxide • Nutrients • Hormones • Waste

  29. Excretory System • This system regulates the volume of liquids in the body. • Removes the waste from blood.

  30. Reproductive System • The reproductive system maintains species. • If we couldn’t reproduce, species would die out and there would be no life.

  31. Homeostasis • All the systems work together and do their own share in maintaining homeostasis. • It is probably one of the most complicated things in the entire world. • Somehow, mother nature, natural selection and evolution created the perfect balance of things. • Something no human or single cell could do consciously. It is just another world wonder.

  32. Works Cited • BSCS Biology A Human Approach. Kendall Hunt Pub, 2007. Print. • Farabee, M. J. "ANIMAL ORGAN SYSTEMS." Estrella Mountain Community College. 18 May 2010. Web. 06 Dec. 2010. <http://www2.estrellamountain.edu/faculty/farabee/biobk/BioBookANIMORGSYS.html>. • "HomeostasisTutorial." Oklahoma City Community College. Web. 06 Dec. 2010. <http://www.occc.edu/biologylabs/Documents/Homeostasis/homeostasis_tutorial.htm>.

More Related