When you take blood pressure, it is expressed in a fraction. The top number of that fraction is systolic pressure- the amount of pressure in your arteries during contraction of your heart muscle... I hope this helped! :)
Plant cells have a cell wall and cell membrane... Animal cells have a cell membrane but no cell wall
the cell membrane is describes as a lipid bi-layer because the cell membrane is primarily made up of phospholipids and proteins.
<u>Explanation:</u>
now a days we dont need gooosbumps or the scientifc name cutis anserine.
it was used by our ancestors when we got afraid or for the cold an example of this is if a predator is attacking us the hair on our skins would point straight and we'd look bigger and hopefully it would scare them away, we can still see this in animals... but in present day its completly useless
