Transcript Life Processes

Life Processes
What are the characteristics of
life?
LIFE PROCESSES
Looking at living things
What is a living thing?
• Imagine that you are space traveler
who lands on an unknown planet. How
could you determine if what you are
looking at is alive. Ex. A rock and a
blade of grass.
What are the life processes?
•
•
•
•
•
•
•
•
NUTRITION
TRANSPORT
RESPIRATION
EXCRETION
SYNTHESIS
GROWTH
REGULATION
REPRODUCTION
Key Concepts
• Metabolism – The sum total of all the life
functions.
• Homeostasis – the maintenance of a
stable internal environment in spite of
changes in the external environment. Ex:
Your body sweats in order to maintain a
proper internal temperature.
Nutrition
• Includes the activities involved in
ingestion (obtaining food from the
environment) and digestion (processing
food for use by the organism). It also
includes egestion (removal of solid
wastes)
Nutrition - Ingestion
Nutrition - Digestion
Nutrition - Egestion
Nutrition – Egestion in Leukocytes
• in which the bacteria, having been
ingested and enclosed in a digestive
vacuole by the leukocyte, are ejected by
the living cellto the outside
TRANSPORT
• The absorption of materials through cell
membranes and the circulation, or
distribution of materials to all the cells of
an organism.
TRANSPORT
• Elodea cells
• Human Circulation
RESPIRATION
• The process of releasing energy from organic
molecules for use by cells.
• During respiration glucose is broken down,
and the energy released is stored in the
compound ATP.
• Energy released by the compound ATP is used
by organisms to perform life functions.
RESPIRATION
• Plants and animals
use the oxygen in
the air to turn food
into energy.
EXCRETION
• The elimination of cellular waste products
from the organism.
• These wastes include water, carbon
dioxide, salts, and nitrogen-containing
compounds.
EXCRETION
• Urine Sample
SYNTHESIS
• Chemical reactions in which small
molecules combine to form larger ones.
• When big things are made from small
things.
SYNTHESIS
• Combining 2 glucose molecules to make a
larger maltose molecule
GROWTH
• An increase in size brought about by
increases in cell size and cell number.
• The raw materials for growth are the
products of synthesis.
GROWTH
REGULATION
• The control and coordination of life
functions.
• Responding to changes in the
environment to maintain homeostasis. Ex:
Your eyes immediately adjusting to the
outside light after watching a movie.
REGULATION
• Nucleus
• Brain
• All living things respond
to changes. Living things
notice changes in their
surroundings and react
to them.
• Eg. Plants grow towards
the light.
• Eg. People react to the
temperature around
them.
REPRODUCTION
• The production of new individuals.
• Reproduction is necessary for the survival
of a species, or kind of organism.
REPRODUCTION
• LIFE PROCESSES VIDEO