{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

BSC-2023_Ch1_2_Fall2011

BSC-2023_Ch1_2_Fall2011 - H uman Biology BSC 2023 U01 I...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Click to edit Master subtitle style 9/20/11 Human Biology BSC 2023 U01 I nstructor: Steven Reinhardt Office: OE 215 Email: [email protected] Office Hours: Monday, Wednesday, Friday; 10:00AM - 12:00PM (Please make appointments in advance) Office phone: TBA Meeting Time / Place: Lecture: Monday, Wednesday, Friday; 1:00 PM – 1:50 PM / Green-Library 100 Learning Materials : Text; Visualizing Human Biology, 3rd Edition, K.A. Ireland Syllabus: http://casgroup.fiu.edu/Biology/pages.php?id=3326
Image of page 1

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

View Full Document Right Arrow Icon
9/20/11 Chapter 1 What is Life?
Image of page 2
9/20/11 Characteristics of Life Respond to external stimuli Alter the environment Sense the environment Adapt to the environment Use energy Reproduce Contain materials found only in living organisms Maintain homeostasis (a constant internal environment) Have a high degree of organization (a system of increasing complexity = The Hierarchy Principle)
Image of page 3

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

View Full Document Right Arrow Icon
9/20/11 Living Things Must Maintain Homeostasis Homeo = unchanging stasis = standing therefore , homeostasis means staying the same Maintenance of a relatively stable internal environment despite continuous outside changes Humans function properly only within narrow ranges of temperature and chemistry A dynamic state of equilibrium Homeostasis is controlled by both conscious and unconscious responses for example , humans maintain body warmth by unconscious blood vessel constriction and by consciously selecting appropriate clothing Generally speaking, if the body is functioning “normally” then the body is in homeostasis. This is more complicated than it appears,
Image of page 4
9/20/11 Living Things Must Maintain Homeostasis
Image of page 5

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

View Full Document Right Arrow Icon
9/20/11 Feedback Loop
Image of page 6
9/20/11 Negative Feedback Loops Most homeostatic control mechanisms are these systems. In which, the output shuts off the original stimulus or reduces its intensity. These Mechanisms cause the variable to change in a direction opposite to that of the initial change, returning it to its “ideal” value. The example of; self-regulating body temperature is a good example of a Negative Feedback Loop. Positive Feedback Loops In these systems, the result or response enhances the original stimulus so that the activity (output) is accelerated. This feedback mechanism is “positive” because the change that occurs proceeds in the same
Image of page 7

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

View Full Document Right Arrow Icon
9/20/11 Organization of Living Matter Hierarchical Principle: ( hahy- uh - rahr -ki-k uh l) is the classifying into successive layers the building blocks of life from the fundamental (atoms) to the complex organism. Chemical Level Cells Tissues Organs Organ Systems Organism ( A Natural organization based on a system of increasing complexity. Each level in the hierarchy is composed of groups of simpler units from the previous level, arranged to perform a specific function) 1. Chemical level: -Atoms; Are tiny particles that make up everything! They can be combined in various ways.
Image of page 8
Image of page 9
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