Maintaining Life

1
Maintaining Life

• Movement includes motion of the whole body,
  individual organs, single cells, and tiny
  organelles

2
Maintaining Life

• Responsiveness the bodys ability to detect and
  respond to changes in its internal or external
  environment
• Ex muscle cells will respond to nerve impulses
  by contracting which generates movement of body
  parts
• Hand on hot surface

3
Maintaining Life

• Metabolism all chemical reactions that are
  happening in the body
• Catabolic Reactions- Breakdown products
• Anabolic Reactions- Build products
• Excretion
• solid/metabolic waste

4
Maintaining Life

• Reproduction the formation of new cells for
  growth or the production of a new individual
• Sexual reproduction- needs two parents, offspring
  are genetically unique from parents
• Asexual reproduction- mitosis

5
Maintaining Life

• Growth increase in body size (replacing and
  developing throughout life)
• Mitosis- when cells need to undergo growth or
  repair

6
Survival Needs(must be available within certain
limits-not enough or too much can be deadly)

• nutrients
• oxygen
• water
• body temperature
• atmospheric pressure

7
Survival

• Homeostasis body's ability to maintain balance
  of internal conditions among its systems
• Ex Glucose in blood (0.1), blood pressure
  (120/80), body temperature (98.6), pH of blood
  (7.4)
• homeo- sameness stasis-still/static
• any deviation in homeostasis is known as disease

8
Feedback System

• Cycle of events in which the status of a body
  condition is continually monitored, evaluated,
  changed, remonitored, reevaluated so on
• 3 parts to a feedback system
• Receptor
• Control center
• effector

9
Receptor

• Body structure that monitors changes in a
  controlled condition and sends information called
  the input (in the form of a nerve impulse or
  chemical signal) to a control center
• Ex Camera- this camera records a touchdown pass
  at the edge of the endzone with less than two
  minutes left in the quarter. This video gets
  sent to the booth for review

10
Control Center

• Body sets the range of values within which a
  controlled condition should be maintained,
  evaluates the input it receives from its
  receptors, and generates output (information in
  the form of nerve impulses or chemical signals,
  that is relayed from the control center to an
  effector) commands when needed
• Ex People in Booth- they watch the video the
  camera recorded and decide if the player was
  inbounds or out of bounds

11
Effector

• Body structure that receives output from the
  control center, produces a response or effect
  that changes the controlled conditions
• Ex Referee- the ref gets a message from the
  booth saying whether the player was inbounds or
  out of bounds resulting in a touchdown or an
  incomplete pass.