Eukaryotic cells have a nucleus and prokaryotic cells do not.
Answer:
1) Skull and Vertebral column
2) Meninges
3) Cerebrospinal fluid.
Explanation:
Central Nervous system:
CNS is the abbreviation of Central Nervous system. CNS controls the whole body functions so it is the most important component of the body. CNS consist of two parts 1) Brain and 2) Spinal cord
Both of these organs are very important and hence need to be protected. Nature provided these organs with certain protective mechanisms these includes
1) Skull and Vertebral column:
Skull is present around brain and vertebral column is present around spinal cord. These structure provides mechanical support to soft parts of CNS.
2) Meninges:
These are the membranes that provide antiseptic environment to the brain and hence protect it from microbes and other harmful substances.
3) Cerebrospinal fluid:
This fluid is present inside meninges which nourishes the brain and protect it from mechanical stresses.
At resting potential, sodium and potassium molecules may most easily pass through the plasma membrane of a nerve cell.
Discussion:
- The two cations can pass through the gradient of concentration thanks to the potassium and sodium permeability channel that are present in the cell. However, potassium leakage channels are much more prevalent in neurons than sodium leakage valves. Because of this, potassium disperses within the cell far more quickly than sodium seeps in.
- K+ ions build up inside the cell while the membrane is at equilibrium as a result of a movement of molecules with the solute concentration.
- By elevating the concentration of cations in the extracellular fluid relative to those inside the cell, the negative resting membrane potential is established and sustained (in the cytoplasm).
Learn more about potassium here:
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The movement of plate tectonics affect the Earth's surface and landscape. For example, when two plates collide, they form mountain ranges as they form plate boundaries (divergent, convergent, transform boundaries). Volcanoes are also formed this way, when two tectonic plates form a boundary that allows magma to rise to the surface.