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Lecture 1Introduction to Animal Anatomy
Body regionsorgan systemsbody cavitiesbody tissues
biological molecules
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Characteristics of all life forms
What are the 7 Characteristics of Life?
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Characteristics of all life forms
1. Living Things are Composed of Cells:
– Single-cell organisms have everything they need to be self-sufficient.
– In multicellular organisms, specialization increases until some cells do only certain things.
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Characteristics of all life forms
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Characteristics of all life forms
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Characteristics of all life forms
2. Living Things Have Different Levels of Organization:– Both molecular and cellular organization.
– Living things must be able to organize simple substances into complex ones.
– Living things organize cells at several levels:
• Tissue - a group of cells that perform a common function.• Organ - a group of tissues that perform a common function.• Organ system - a group of organs that perform a common function.• Organism - any complete living thing.
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Characteristics of all life forms
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Characteristics of all life forms
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Characteristics of all life forms
3. Living Things Use Energy: – Living things take in energy and use it for
maintenance and growth.
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Characteristics of all life forms4. Living Things Respond To Their
Environment:– Living things will make changes in response to a
stimulus in their environment.– A behavior is a complex set of responses.
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Characteristics of all life forms
5. Living Things Grow: – Cell division - the orderly formation of new cells.– Cell enlargement - the increase in size of a cell.
Cells grow to a certain size and then divide.– An organism gets larger as the number of its cells
increases.
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Characteristics of all life forms
6. Living Things Reproduce: – Reproduction is not essential for the survival of
individual organisms, but must occur for a species to survive.
– All living things reproduce in one of the following ways:
• Asexual reproduction - Producing offspring without the use of gametes.
• Sexual reproduction - Producing offspring by the joining of sex cells.
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Characteristics of all life forms
6. Living Things Adapt To Their Environment:– Adaptations are traits giving an organism an
advantage in a certain environment.– Variation of individuals is important for a healthy
species.
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Characteristics of all life forms
• Questions:1. Do all living things have all of the characteristics
of life? If your answer is no, give an example.
2. Name some non-living thing that uses energy.
3. Name some non-living thing that grows.
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• What is anatomy?– Anatomy– Anatomy can be divided depending on the
basis of the degree of structural detail under consideration into:
• Microscopic anatomy.
• Gross (macroscopic) anatomy.
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• Microscopic anatomy:– It deals with structures that cannot be seen without
magnification.– With light microscope, you can see basic details of cell
structure.– With electron microscope, you can see individual
molecules that are only a few nanometers across.– Microscopic anatomy includes:
» Cytology
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» Histology
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Eleven Organ Systems:What does each do?How are they studied?Gross anatomycytologyhistologyinteractions - homeostasis
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