Action potential and Na+. It is a fact that Na+ ions cross the membrane and enter the cell during the rising phase of the action potential. The process happens because Na ions channels are open. Then the ions channels becomes inactivated/closed for a while. What happens to the Na+ ions that entered the cell?
Product (mathematics) In mathematics, a product is a number or a quantity obtained by multiplying two or more numbers together. For example: 4 Ã 7 = 28 Here, the number 28 is called the product of 4 and 7. The product of 6 and 4 will be 24, because 6 Ã 4 = 24.
A negative number is a number below zero. It can be an integer or a decimal and is written with a minus sign (-) in front of it, like this: -3. You can get an idea of what a negative number is with a number line, like this one: ---|---|---|---|---|---|---|---|---|---|---|---|---|---|- ... -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 You can see from this number line that you can continue counting down when you get to zero.