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The characteristics of living organisms can be summarised by the words “
MRS GREN
.”
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There are 4 main types of tissue namely:
epithelial, connective, muscle
and
nervous tissues
.
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Epithelial tissues
form the skin and line the gut, respiratory tract, bladder etc.
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Connective tissues
form tendons, ligaments, adipose tissue, blood, cartilage and bone, and are found in the dermis of the skin.
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Muscular tissues
contract and consist of 3 types:
smooth, skeletal and cardiac
.
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Vertebrate bodies have a
head, trunk
and
tail
. Body organs are located in
body cavities
. 11 body systems perform essential body functions most of which maintain a stable environment or
homeostasis
within the animal.
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Directional terms
describe the location of parts of the body in relation to other parts.