How many galaxies are there in the observable universe? How many cells are there in the human body? We know both of these numbers must be really big.
Humans are complex organisms made up of trillions of cells, each with their own structure and function. Scientists have come a long way in estimating the number of cells in the average human body. Most recent estimates put the number of cells at around 30 trillion.
All rights reserved. A simple question deserves a simple answer. How many cells are in your body?
Are you fascinated by the incredible machines around you? On a typical day, you might ride in an automobiletalk on a smartphoneaccess the Internet on a computerand watch a movie on a high-definition television. While all of these machines are awesome examples of today's technology, they're not nearly as impressive as another complex machine.
But these cells aren't all the same types of cells. Together, they let your body function as a whole. So to put it in a joke format, how many types of cells does it take so that an adult human can screw in a light bulb?
Table 1: Number of cells in selected organisms based on counting using light or electron microscopy for values smaller than 10, or for larger values, estimated based on average cell size and total organism size. The fact that all organisms are built of basic units, namely cells, is one of the great revelations of biology. Even though often now taken as a triviality, it is one of the deepest insights in the history of biology and serves as a unifying principle in a field where diversity is the rule rather than the exception.
It's a surprisingly hard question to answer, but Dr Karl has tracked down a reasonable estimate of the number of cells in the human body. By Karl S. Scientists have worked out how many cells there are in a average adult male.
Learn about The Nobel Prizes that have been awarded sinceas well as the criteria and nomination process that are used to select the winners. NASA Kids is an excellent site for "kids" of all ages and provides an abundance of information, images, and interesting things to do on astronomy and the space sciences. In this lesson, students learn about sources of high-energy radiation and calculate student exposure to ionizing radiation over the past year.