i wish i paid better/more attention today.. but what can is ay.. i was sleepy.. all day.
homeostasis is the process that body's take to maintain internal temperature.
old example of the titanic brought up again.. this time more explained. see if the body's internal temperature drops below like around 20, the heart will stop functioning.. and taht screws everything. what happened with the people of the titanic though.. coz they were floating in the water.. and water is a good conductor of heat.. the water stole their heat.
as much as possible, the body tries to keep the internal temperature at around 36-38. it has a number of receptors all over that detect ambient temperature, just like otherparts of the body have other receptors for other senses.
when its hot.. capillaries in the skin swell up to get rid of heat, so more blood flows through, making our skin appear redder. glands secrete sweat so that when it is evaporated, it takes some of the body's heat with it.
likewise for when its cold.. the capillaries shrink, less blood = paler appearance. we shiver because shaking enciourages movement of molecules, prodcing heat. hair on our skin sticks up, whichj traps air, creating an insulator (air is a poor conductor of heat)
that's all to say about that.. the other bits of the video were random.
kindneys' role is to regulate water in blood. the blood dumps all the water in there, then the kidneys return the right amount to the blood, any excess is peed out. that's why when we're dehydrated, we dont pee much, and its more concentrated. the blood is trying to conserve water.
talking about blood sugar levels.. sugar that we eat is used up really quickly. if we dont have enough sugar though, the pancreas releases a hormone called glucagon to the liver, which then releases stored glycogen as glucose.
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