Download characteristics of life - Manasquan Public Schools

Characteristics of Life
Suzanne D'Anna
1
Characteristics of Life
movement
 responsiveness
 growth
 reproduction
 respiration

Suzanne D'Anna
digestion
 absorption
 circulation
 assimilation
 excretion

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Movement
ability to propel oneself
 manipulates external environment
 occurs voluntarily by allowing
movement of body fluids throughout the
body

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3
Responsiveness
ability to respond to stimuli
 Examples:
- excessive CO2 in blood - body will
involuntarily respond by increasing
breathing rate.

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4
Growth
increases size, increases number of cells
 cell construction must exceed cell
destruction

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5
Reproduction
new organism
 cells must be able to
reproduce to aid body
in growth and repair.

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Respiration
process of obtaining O2 for
cell metabolism
 removing CO2

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Digestion

enables body to break down foods into
simpler forms to be absorbed in blood
for delivery to cells via cardiovascular
system.
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Absorption

passage of digested materials through
membranes of the digestive tract
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Circulation

movement of substances throughout the
body within body fluids
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Assimilation
includes breaking down complex to
simple
 involves digestive, respiratory,
circulatory, and lymphatic systems

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Excretion

removal of wastes after digestion and
metabolism
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Survival Needs of an Organism

Nutrients
- Carbohydrates
- Proteins
- Fats
- Vitamins
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Survival Needs of an Organism
(cont.)
Oxygen
- used for chemical reactions
- 20% of air we breathe is O2
 Water
- 60-80% of body weight
- most abundant chemical substance in
body - must be regulated

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Survival Needs of an Organism
(cont.)
Body Temperature
- 37o C/ 98.6o F
- as body temperature drops so does
metabolic rate.
 Atmospheric Pressure
- external force on body

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Homeostasis

the body’s ability to maintain a stable
internal environment
When is the body in homeostasis?
- when needs are adequately met
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