Chapter 40 (2)

Card Set Information

Author:
DesLee26
ID:
73582
Filename:
Chapter 40 (2)
Updated:
2011-03-17 20:43:43
Tags:
Section
Folders:

Description:
AP Bio
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user DesLee26 on FreezingBlue Flashcards. What would you like to do?


  1. Faced with environmental fluctuations, animals manage their internal environment by either __ or __.
    • regulating
    • conforming
  2. An animal is said to be a __ for a particular environemtal varibale if it uses internal control mechanisms to regulate internal change in the face of external fluctuation.
    regulaor
  3. An animal is said to be a __ for a particular environmental variable if it allows its internal condition to conform to external changes in the variable.
    conformer
  4. _ and __ represent extremes on a continuum. An aimal may regulate some internal conditions while allowing others to conform to the environment.
    regulating and conforming
  5. The steady body temperature of a river otter and the stable concentration of solutes in a freshwater bass are examples of __, which means "steady state", or internal balance. In achieving __, animals maintain a relatively constant internal environment even when the external environment changes significantly.
    o Like many animals, humans exhibit __ for a range of physical and chemical properties, like body temp or pH.
    homeostasis x3
  6. How does an animal achieve homeostasis?
    By maintaining a variable, like body temp or solute concentration, at or near a particular value, or set point.
  7. Fluctuations in the variable above or below the __ serve as the __. A receptor, or __, detects the stimulus and triggers a __, a physiological activity that helps return the variable to the __.
    • set point
    • stimulus
    • sensor
    • response
    • set point
  8. Homeostasis in animals relies largely on __, a response that reduces, or "damps" teh stimulus.
    e.g sweating
    negative feedback
  9. Homeostasis is a __, the interplay between external factors that tend to change the internal environment and internal control mechanisms that oppose such changes. __ reduces but doesn't eliminate changes in the internal environment. Additional fluctuation occurs if a variable has a __- an upper and lower limit- rather than a single __. Regardless of whether there is a __ or a normal range, __ is enhanced by mechanisms that reduce fluctuations, such as insulation in the case of temp and physiological buffers in the case of pH.
    • dynamic equilibrium
    • homeostasis
    • normal range
    • set point x2
    • homeostasis
  10. Although __ also occur in animals, these circuits do not usually contribute to __. Unlike __, __ triggers mechanisms that amplify rather than diminish the stimulus.
    • positive feedback loops
    • homeostasis
    • negative feedback
    • positive feedback
  11. The __ and normal ranges for __ can change under various circumstances. In fact, so-called __ in teh internal nvironment are essential to normal body functions. Some __ are associated with a particular stage in life, such as the radical shift in hormone balance that occurs during puberty. Other __ are __, such as the variation in hormone levels responsible for women's menstrual cycles. Over the short term, __ mechanisms maintain the __ in effect during a particular interval. Over the longer term, __ allows regulated change in teh set point and therefore in teh body's internal environment.
    • set points
    • homeostasis
    • regulated changes x3
    • cyclic
    • homeostatic
    • set point
    • homeostasis
  12. One way in which the normal range of homeostasis may change is through __, teh process by which an animal adjusts to changes in its external environment. __, a atemporary change during an animal's lifetime, should not be confused with __, a process of change in a population brought abou tby natural selection over many generations.
    • acclimatization x2
    • adaptations

What would you like to do?

Home > Flashcards > Print Preview