Chapter 1 - Bio 2870 - CHAPTER 1 Homeostasis has to do with...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
CHAPTER 1 - Homeostasis has to do with the existence of a stable internal environment. The internal environment is different from the external environment and requires many homeostatic mechanisms to maintain the internal conditions. - Homeostasis is absolutely essential for life. Disease occurs when our body has lost control of its homeostatic mechanisms. - An intrinsic mechanism is one that requires the organ itself to respond to a change. (Ex: low oxygen levels in the blood stream will cause cells of our body to release chemicals to release more oxygen to the cells) - An extrinsic mechanism is one where the nervous system or the endocrine system will kick in to respond to a change. ( Ex: low oxygen levels in the blood stream will cause our body to release a hormone that will regulate the oxygen flow to our body) - All homeostatic mechanisms have three basic components: Receptor Control Center Effector - Afferent Information (Sensory Information) is any information coming into the body. - Efferent Information (Command Information) – sends commands to the body to do something - Negative Feedback (Bionegative Feedback) – always works to oppose a change to keep conditions close to a set point. ( Ex: If your body temperature rises, temperature receptors in the skin will send Afferent information via neurons to the central nervous system in the hypothalamus to send out an Efferent command to lower the body temperature. Our body sweats, gives off heat, and body temperature is lowered.)
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern