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The boundary of the animal cell is the cell or plasma membrane. It is semi permeable, meaning it selectively transports ions or salts across the cell. They have transport proteins such as ion channels and receptor proteins than regulates transport and signalling events respectively.
Passive and active transport. Passive transport doesn't require the cell's energy, while active transport does.
I think it is the Cilia in the animal cell also in the human cell
Semi-permeable. Permeable means things can pass through, so semi-permeable means only some things can pass through.
The cell membrane surrounds the cytoplasm. It works as a semipermeable filter for those substances required by the cell. It is elastic in nature and grows along with the increasing volume of cytoplasm.
VesiclesCell walls are the small structure. This is what transports the substances.
The golgi bodies regulate the transport of materials in and out of the cell.
The jobs of water is to transport substances, regulates body temperature, and provide lubrication.
Cilia
Cell membrane
A cell membrane is found on both plant and animal cells it selectively chooses what substances may enter or leave the cell. Hence the term selectively permeable. For a more advanced explanation I recommend you research protein icebergs and the different types of transport a membrane can take part in. Example active transport
The boundary of the animal cell is the cell or plasma membrane. It is semi permeable, meaning it selectively transports ions or salts across the cell. They have transport proteins such as ion channels and receptor proteins than regulates transport and signalling events respectively.
Passive and active transport. Passive transport doesn't require the cell's energy, while active transport does.
active transport
A small spherical phospholipid bilayer (for polar substances) or monolayer (for hydrophobic substances). They also have embedded, enclosing or attached proteins for targeting, structure and transport.
it selectively lets thingd transport into and out of the cell
Osmosis is the movement of water molecules across a selectively permeable membrane.