hey guys it's medical is perfection Ellis welcome to my new series on physiology today's topic is an introduction to the great field of physiology so let's get started [Music] so let's break this word down physiology from the Greek words thesis and logia thesis means origin or nature logia means the study off but we are not talking about every kind of physiology we are talking about human physiology because this is called medic osis perfect nails let's define human physiology it's the study of function of the human body and its mechanisms so Anatomy was the study of structure physiology is the study of function not only function the mechanism by which we carry out this function physiology is all about regulation and communication your body is well regulated and it has excellent communications you have fast communications to the neurons and slow winds through the endocrine system as you know the cell is the basic living unit or the building block of your body how many cells do you have around 100 trillion cells that's amazing just think about that your body a coordinated solution let's talk about the internal environment or as they say it in French Malou into you so your body has 60% of its weight just water this 60% is subdivided into the intracellular compartment which is inside your cells and it's 2/3 of the 60% and the rest is the extracellular fluid outside of yourself and this is one third of the 60% suppose that your weight is 100 kilograms 60 kilograms will be waters which is equal 60 liter because the density of water is 1 hello physics so intracellular is two-thirds of the 60 liters which is about 40 liters the extra cellular is the rest which is to any liters total is 60 makes sense your cells literally live in the extracellular fluid these are your cells and here is the extracellular fluid surrounding the cells that's why we call the extracellular fluid the internal environment the ECF is the internal environment what's the ECF it's water of course with ions oxygen nutrients and the bad stuff the waste products so we have the good stuff and the bad stuff ions such as sodium chloride and bicarbonate nutrients such as amino acid fatty acids and glucose the building blocks of protein fat and carbs waste products co2 which is going to go to the lung to be exhaled out and some other garbage stuff going to the kidney to be excreted in the form of urine back to our story of the ECF ECF is circulating in your blood coming out of your heart in a vessel called an artery and then to the capillaries and then there is diffusion to the tissue and then back to the vein and then back to the heart and this is the cycle of the ECF in other words the ECF is everywhere that's why is the internal Malou now let's turn our attention to the intra cellular fluid what's inside the cell again water with ions but different types of ions you have potassium magnesium phosphate ions this is different from the extra cellular fluid which had sodium chloride and bicarbonate these are different stuff now I'm not saying that you will never find sodium in this hell no I'm just saying that sodium is more common outside of the cell than inside by the same token potassium can also be found outside of the cell it's just more common intracellularly these ions keep flowing in and out in and out they are regulated we call this ion concentration difference and we will talk about that later in the next video we will talk about homeostasis not to be confused with hemostasis these are totally different so I strongly urge you to subscribe and hit the bell to get notified when I release my next video on homeostasis also I'm available in Facebook Twitter SoundCloud Instagram and you can support this channel on patreon you'll get early access you can request individual videos on certain topics and plus extra perks thank you so much for watching this is medicals perfection Ella's as always be safe stay happy and study hard