مراقبة خسارة الماء مع البول لقد اتضح أن تغييرات بسيطة جدا في الضغط الاسموزي لبلازما الدم او في حجمها (حتى لو كان التغيير %2 فقط) تؤثر على افراز ADH الذي يعمل على إعادة التركيز الدم وحجمه الى الوضع الاعتيادي.فكيف يحصل ذلك؟
يحصل على النحو التالي:
تحفيز اسموزي: ان ارتفاع الضغط الاسموزي للدم يؤدي الى اثارة مستقبلات اسموزية موجود في مقدمة الهيبوثلاموس، التي تحفز بدورها الغدة النخامية على افراز ADH. وكما ذكرنا فان ADH يحفظ... Continue Reading
Ocean Acidification When carbon dioxide (CO2) is absorbed by seawater, chemical reactions occur that reduce seawater pH, carbonate ion concentration, and saturation states of biologically important calcium carbonate minerals. These chemical reactions are termed "ocean a... Continue Reading
Photoelectric effect Photovoltaic
is an applied technology for the utility of solar energy, which covers the conversion
of light into electricity using metal materials that exhibit the photoelectric effect.
photoelectric effect is a phenomenon that ... Continue Reading
we are surrounded by lightBut we do not ask ourselves what light actually is ?
when we look in a mirror we can see ourselves
when we look at a spoon in a glass of water it looks broken
What is rainbow?
When light hits an o... Continue Reading
Every object in nature that located at certain height and gravity acting on it has potential energy. We can calculate use the equation Up=m*g*h. The energy released when the object falls.In elevating system we use weigh... Continue Reading
Backgammon Game Consider throwing a coin multiple times. Even huge amount of times. Let's discuss - what would be the number of times you would get a particular side out of the total number of throws?
Let's see that in any occasion of throwing a symmetri... Continue Reading
Conductivity of solutions Why do some solutions conduct electricity, but other
don't? To answer the above question we should learn more
about substances. We can divide substances in two different types: Electrolytes
To learn more about thi... Continue Reading
Fossils arround the world What are fossils?
Fossils are traces of plants, animals, fishes, and other organisms from the remote past.
Scientists have learned that rocks are stacked in layers containing fossils with the oldest fossils at the deepest layers, and the ... Continue Reading
Why does Earth have deserts? Take a look at a physical map of the world. You can notice that all deserts on our Earth are located at approximately thirty degrees on either side of the equator.
Learn what is the reason for that phenomenon from the video below ... Continue Reading
Plastic recycling Plastic is manufactured by the polymerization
process, which connects monomers to create polymers. Common types of polymers in
our lives are presented in the table below:
Example... Continue Reading
Sea level rise risk Sea level is a term describing the altitude of the water at sea(Haifa) picture taken by :dina izGlobal warming due to human activity has countless examples all over the world.Global warming is basically the constant rise of the world average temperat... Continue Reading