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Not all antibodies can cross the P.B. only IgG antibody can pass through it. Many drugs cant also pass through and they are save to be used during pregnancy. RBCs cant pass either (maternal and fetal blood never should never mix).
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∙ 13y ago
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∙ 11y agoIgG
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What does it mean to say most biological membranes are selectively permeable?
Selectively permeability is a property of biological membranes that allows them to regulate the passage of substances across them. In spite of heavy traffic through them, cell membranes are selectively permeable, and substances do not cross the barrier indiscriminately.
Do all substances pass freely between the intracellular and extracellular fluids through a phospholipid bilayer?
No, the membrane is known as semi-permeable because some substances (such as water) can pass freely through - whereas others (such as ions) cannot.
Why is the cell membrane described as being a selective barrier?
Cell membranes are selective barriers because they only let certain substances pass through and therefore ensures the cells survival.
How does the body defend itself from meningitis?
Through the brain has very good blood supply, there is something called as blood brain barrier. There are tight junctions in the cappilaries and from outside a layer of connective tissue cells. So that bacteria cannot pass through this barrier. So meningitis is relatively rare disease.
When some substances can pass across them but others cannot biological membranes are said to have?
They are said to have semi-permeable membranes.That is,they allow some substances to pass through & prevent others due to the nature & composition of that substance.
What does it mean to say most biological membranes are selectively permeable?
Selectively permeability is a property of biological membranes that allows them to regulate the passage of substances across them. In spite of heavy traffic through them, cell membranes are selectively permeable, and substances do not cross the barrier indiscriminately.
What is a visual barrier?
a visual barrier is when you cannot see something / someone .
How does scabies affect a pregnant woman and her baby?
No. Scabies is a dermal (skin) disease caused by mites. While small, they are much larger than other types of infectious agents, and cannot enter the bloodstream. In any event, there is a placental blood barrier between the mother and fetus, which blocks most organisms. A scabies mite cannot pass through this barrier. Newborn infants should receive treatment if they are exposed during birth. (For treatment of scabies, see the related link)
Can you go through security walls i smack down vs raw 2009 or wii?
No you cannot go through the security barrier in S v R 2009.
What is the cell membrane which makes some substances can pass through it while others cannot?
The phospholipid bi-layer.
Substances that cannot be broken down chemically into substances are?
Elements.
What term refers to a substances that can only be broken down chemically?
Molecules of substances cannot be broken down unless through chemical means. The bonds between atoms in molecules are too strong to break apart through other means.
Do all substances pass freely between the intracellular and extracellular fluids through a phospholipid bilayer?
No, the membrane is known as semi-permeable because some substances (such as water) can pass freely through - whereas others (such as ions) cannot.
What is the name for a substance cannot be separated into simpler substances?
An element cannot be separated into simpler substances by chemical means.
Substances that cannot be broken down by chemical mean?
Substances that cannot be chemically broken down into simpler substances are called elements.
What are hard substances?
The substances that are hard and which cannot be scratched is known as hard substances
Why is the cell membrane described as being a selective barrier?
Cell membranes are selective barriers because they only let certain substances pass through and therefore ensures the cells survival.
