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There are two reasons why a Hydra does not need a circulatory system. 1) It is small. The body wall has only two cell layers separated by a non-cellular layer, xo substances have only a short distance to move. Over these short distances diffusion is adequate. 2) It has a large surface area compared with its volume (large SA:V ratio). This is because its body is hollow, so it can absorb substances over the inner surface as well as the outer surface. See http://en.wikipedia.org/wiki/Circulation_%28physiology%29
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What is one difference between one-celled organisms and cells in a organ?
One-celled organisms are their own thing. They, by themselves, take in energy, maintain homeostasis, and carry out other essential life processes. There are other cells that make up organs, and those organs make up organ systems, and those organ systems make up an organism. Those cells that make up organs can't survive alone; they need the support of other cells, organs, and organ systems to survive.
Do more complex organisms need more energy than simpler organisms?
Yes, generally more complex organisms require more energy to support their increased metabolic demands. This is because complex organisms have more specialized cells and tissues, perform more complex functions, and require larger and more efficient organ systems to sustain their body functions.
Why bacteria cannot have organs?
Bacteria are single-celled organisms without complex internal structures like organs. They lack specialized tissues and organ systems found in multi-cellular organisms because they are unicellular and have a simple structure with no need for organs to carry out their basic functions.
Why don't plants require complex organ systems?
Plants do not require complex organ systems like animals because they have evolved different strategies to meet their needs. They utilize structures like roots, stems, and leaves to carry out essential functions such as absorption, support, and photosynthesis. These structures can perform multiple roles efficiently without the need for specialized organs.
Does mitochondria stop functioning in a unicellular organism exposed to pollutants indicates organ system?
Yes, if a unicellular organism is exposed to pollutants, it can disrupt mitochondrial function, leading to decreased energy production and eventual cell death. This disruption can impact the entire organism since unicellular organisms do not have specialized systems like organ systems to compensate for the loss of function in mitochondria.
Do all organisms need an organ?
Not every organism need organs.Unicellular organisms do not have any way.
Do all organisms have a organ system?
No, because if you have a single celled organism, you don't have enough cells to make a tissue, so you won't have enough tissue to make organs, and you won't have any organs to create an organ system.
Why does the arm need many organ systems?
Just does. Deal with it.
What is one difference between one-celled organisms and cells in a organ?
One-celled organisms are their own thing. They, by themselves, take in energy, maintain homeostasis, and carry out other essential life processes. There are other cells that make up organs, and those organs make up organ systems, and those organ systems make up an organism. Those cells that make up organs can't survive alone; they need the support of other cells, organs, and organ systems to survive.
Why do you need to study the human organ systems?
because this is our human body
Are organ systems related?
They all work together to make an organism.
Why have large organisms devolped systems like the respirtory system?
because they need to breath!
Do more complex organisms need more energy than simpler organisms?
Yes, generally more complex organisms require more energy to support their increased metabolic demands. This is because complex organisms have more specialized cells and tissues, perform more complex functions, and require larger and more efficient organ systems to sustain their body functions.
Why bacteria cannot have organs?
Bacteria are single-celled organisms without complex internal structures like organs. They lack specialized tissues and organ systems found in multi-cellular organisms because they are unicellular and have a simple structure with no need for organs to carry out their basic functions.
Why does the body need so many organs systems?
Each organ system is specialized with doing only one job.
Why don't plants require complex organ systems?
Plants do not require complex organ systems like animals because they have evolved different strategies to meet their needs. They utilize structures like roots, stems, and leaves to carry out essential functions such as absorption, support, and photosynthesis. These structures can perform multiple roles efficiently without the need for specialized organs.
Does mitochondria stop functioning in a unicellular organism exposed to pollutants indicates organ system?
Yes, if a unicellular organism is exposed to pollutants, it can disrupt mitochondrial function, leading to decreased energy production and eventual cell death. This disruption can impact the entire organism since unicellular organisms do not have specialized systems like organ systems to compensate for the loss of function in mitochondria.
