necessary life functions

• Movement

  • locomotion
  • movement of substances
• Responsivness

  • ability to sense changes and react
• DIGESTION

  • break down and deliverynof nutrients
• metabolism

  chemical reactions within the body

  production of energyaking body structures

  making body structures
• Excretion

  • Elimination of waste from metabolic reactions
• • Reproduction
  • production of future generations
• Growth

  • increasing the cell size and number
• what are the SURVIVAL NEEDS?

  water

  stable body temperature

  nutrients

  atmospheric pressure must go appropriate
• Nutrients

  • chemicals for energy and cell building
  • Includes carbohydrates, proteins, lipids, vitaminsncludes carbohydrates, proteins, lipids, vitamins
• HOMEOSTASIS 

  Maintenance of a stable internal environment = a dynamic state of equilibrium 

  Homeostasis must be maintained for normal body functioning and to sustain life
• Homeostatic imbalance

  • disturbance in homeostasis resulting in disease
• MAINTAINING HOMEOSTASIS 

  • the body communicates through neural and hormonal control system
• RECEPTOR

  responds to changes in the environment (stimuli)

  Sends information to control center
• Control center

  determines set point

  Analyzes information 

  Determines appropriate response
• Effector

  • provides a means for response to the stimulus
• what are the two feedback mechanism?

  • negative feedback
  • positive feedback
• Negative feedback

  includes most homeostatic control mechanisms

  Shuts off the original stimulus or reduces its intensity

  Works like a household thermostat
• Positive feedback

  increases the original stimulus to push the variable farther

  in the body this only occurs in blood clotting and birth of a baby
• Maintenance of a stable internal environment = a dynamic state of equilibrium