7.4 Homeostasis and Cells. Homeostasis Cells need to maintain a constant internal chemistry, size,...
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Transcript of 7.4 Homeostasis and Cells. Homeostasis Cells need to maintain a constant internal chemistry, size,...
![Page 1: 7.4 Homeostasis and Cells. Homeostasis Cells need to maintain a constant internal chemistry, size, shape, etc…. even though the surrounding environmental.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d755503460f94a561ec/html5/thumbnails/1.jpg)
7.4 Homeostasis and Cells
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Homeostasis• Cells need to maintain a constant internal chemistry, size, shape, etc…. even though the
surrounding environmental conditions change.
• Homeostasis is the maintenance of a stable level of internal conditions, size, shape, etc….
and it requires cellular transportation.
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Unicellular Organisms
Living organisms made up of only one cell
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Multicellular OrganismsLiving organisms made up of many cells
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Cell SpecializationThe cells of multicellular organisms are specialized
for particular tasks and communicate with one another to maintain homeostasis.
Stem Cells
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Levels of Multicellular Organization
• Cells• Tissues• Organs• Organ Systems• Organisms
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Cells are Organized into Tissues
A tissue is a group of cells alike in structure and function.
Skeletal muscle tissue
Cardiac (heart) muscle tissue
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Tissues are Organized into Organs
An organ is a group of tissues which work together to perform a specific function.
Kidneys Heart
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Organs make up Organ SystemsAn organ system is a group of organs working together to perform a specific
function.
Circulatory System Digestive System
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Organ Systems make up Organisms
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Cell Communication
The cells of multicellular can communicate using chemical signals, such as hormones.
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Receptors and CommunicationIn order to respond to a chemical signal a cell
must have receptors the signal molecule can “plug” into.