If you are lying down and stand up quickly, you can get dizzy or feel faint. this is because the blood vessels don't have time to expand to compensate for the blood pressure drop. if your brain is 0.4 m higher than your heart when you are standing, how much lower is your blood pressure at your brain than it is at your heart? the density of blood plasma is about 1025 kg/m3 and suppose your maximum (systolic) pressure of the blood at the heart is 119.8 mm of hg (note that 120 mm of hg = 16 kp = 1.6 x 104 n/m2). since most doctors still use mm of hg, give your result in those units.

i need the answer to this too but idk it ; -;

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.