Download Survival Need or Necessary Life Function?

Survival Need or Necessary Life Function?
Metabolism
Nutrients
Reproduction
Oxygen
Water
Maintaining Boundaries
Excretion
Normal Body Temperature
Responsiveness
Atmospheric Pressure
Movement
Growth
Digestion
Intro to Anatomy – Lesson 4
TSWBAT identify the eight
necessary life functions and five
survival needs that are necessary
for an organism to sustain life.
Necessary Life Functions and Survival Needs
• Organisms must be able to carry out various
functions in order to maintain life.
• If any of these necessary functions are disrupted, the
organism may not survive.
• Organisms have several survival needs that must be
present in order to sustain life.
Necessary Life Functions I
1. Maintaining boundaries – the internal environment
remains distinct from the external environment.
A. Cellular level – accomplished by plasma
membranes
B. Organismal level – accomplished by the
integumentary system
Necessary Life Functions I
2. Movement – locomotion, circulation, absorption, and respiration
I.E: All of the activities promoted by the muscular system as well as
the movement of substances such as blood, food, and urine.
Necessary Life Functions I
3. Responsiveness (Irritability) – the body’s ability to
sense changes in its environment and then react to them
I.E. If you touch a hot burner you will involuntarily pull
your hand away from the painful stimulus (fire).
I.E. When the amount of carbon dioxide in your blood
rises to dangerously high levels, your breathing rate
speeds up to blow off the excess carbon dioxide.
Necessary Life Functions I
4. Digestion – breakdown of ingested food into simple molecules
that can be absorbed into the blood.
5. Metabolism – refers to all chemical reactions that occur within
body cells. Regulates the ability to convert nutrients to energy.
6. Excretion – removal of wastes from the body
7. Reproduction – cellular and organismal levels
 Cellular – an original cell divides and produces two identical
daughter cells that may be used for body growth or repair
 Organismal – sperm and egg unite to make a whole new
person
8. Growth – increase in body size
5 Survival Needs – The goal of all body
systems is to maintain life. Several factors
need to be available for this to occur.
1. Nutrients
Chemical substances used for energy and cell
building.
2. Oxygen
Needed for metabolic reactions (human cells can
only survive for a few seconds without it).
5 Survival Needs
3. Water
Provides the necessary environment for
chemical reactions. Accounts for 60-80
percent of body weight.
4. Normal body temperature (Heat)
Necessary for chemical reactions to occur at lifesustaining rates. For good health, body
temperature must be maintained at or around 98
degrees.
5 Survival Needs
5. Atmospheric pressure
Required for proper breathing and gas exchange in
the lungs.
Check Point:
1. Having a fever, high blood pressure, or low blood
sugar are all examples of what process being out of
balance?
2. Reproduction can occur on two levels, they are?
3. The ability to keep the “inside” inside and the
“outside” outside is an example of which necessary
life function?
4. What is needed for metabolic reactions to occur?
5. What survival need provides energy for the body?
Answer to checkpoint
1. Responsiveness
2. Cellular or organismal
3. Maintenance of boundaries
4. Oxygen
5. Nutrients