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The placenta acts as a selective barrier to protect the developing fetus from harmful substances while facilitating the exchange of nutrients and waste. It consists of specialized cells that limit the passage of small particles, including pathogens and toxins, through tight junctions and other mechanisms. This selective permeability ensures that only essential substances, like oxygen and certain nutrients, can cross while keeping harmful agents at bay. However, it is not entirely impermeable, as some small particles, such as certain drugs and infections, can still pass through.
What else can I help you with?
What is a small opening to allow the passage of air?
A small opening to allow the passage of air is called a vent. Vents are commonly found in buildings to facilitate air circulation and maintain proper ventilation.
What are small particles that don't allow water to absorb quickly?
Chloroplast
What causes a small gritty placenta?
what causes a gritty discoloured placenta
Why are puppies small?
To allow them easier passage through the birth canal.and some dogs are very small so they stay like that
What is the purpose of alum in cooking sedimentary rocks?
It removes the negative charges that allow small particles to stay in suspension. This allows the small particles (such as clay) to settle out of the solution.
Why are puppies so small?
To allow them easier passage through the birth canal.and some dogs are very small so they stay like that
Small particles pass though passage waysin the cell membrane is called?
diffusion. osmosis is when it is water. and water only.
What structure allow small particles to cross cell membrane?
Osmosis.
What are the differences between the placenta and the small intestine?
The placenta provides nutrients for the fetus, the small intestine provides nutrients to the mother.
What allows the passage of small molecules between animal cells?
Gap junctions allow the passage of small molecules and ions between animal cells. They consist of protein channels that connect the cytoplasm of adjacent cells, facilitating communication and the exchange of signaling molecules.
What is an enterostomy?
An enterostomy is an operation in which the surgeon makes a passage into the patient's small intestine through the abdomen with an opening to allow for drainage or to insert a tube for feeding
What name is given to the trans-membrane proteins that allow the direct passage?
The name given to the trans-membrane proteins that allow the direct passage of small molecules across the cell membrane is "channel proteins." They form channels or pores that facilitate the movement of specific ions or molecules across the membrane.
