خلية الدم الحمراء لا تحتوي الخلية الحمراء الناضجة على ريبوسومات (الضرورية لانتاج البروتينات) وبالتالي فهي غير قادرة على تجديد بروتيناتها ولا تحتوي على ميتوكوندريا (الضرورية للتنفس الخلوي الهوائي) وبالتالي تقوم بتنفس لا هوائي فقط . من ناح... Continue Reading
في الدم PH تنظيم ال الكلى هي إحدى أجزاء الجهاز البولي في جسم الإنسان، وهي عبارةٌ عن كليتين تقعان على الجدار الخلفي لتجويف البطن على جانبي العمود الفقري أسفل الحجاب الحاجز، وتشبه الكلية في شكلها حبة الفاصولياء، ولونها بني مائل للأحمر، ويصل... Continue Reading
The speed of falling objects
hundred years ago, the Italian scientist Galileo Galilei claimed that in the
absence of any atmosphere, all bodies on earth (e.g. a hammer and a feather)
would fall to the ground in the same speed, since there would be no air
resistanc... 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
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
arithmetic sequence Arithmetic Sequence
In an Arithmetic Sequence the difference between one term and the next is a constant. In other words, we just add the same value each time ... infinitely.
In General we could write an arithmetic sequence like ... 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
complex numbers multiplication A сomplex number is represented by z=a+bi , a and b are real numbers and i is the imaginary unit ,satisfying the equation i2 = −1.
For more information about complex numers link to:
http://blossoms.mit.edu/videos/lessons/compl... 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
density of materials Watch the video below:Density is a characteristic property of a material, which expresses the relationship between the mass of the material and the volume (how much space the material takes up).According to the video, where do we float more... 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
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