Short term memory
Memory is of three types:
1. Iconic memory that lasts only for a split second
2. Short term memory can help you remember for about 5 minutes.
3. Long term memory can store things for a life time.
In our daily lives, we see thousands and thousands of things. The brain processes each one of them but remembers only what you need to rememer. Do you remember all the trees you saw on the roadside today or how many times you stopped at red traffic lights today?
As a person gets older, the short term memory becomes weaker but the long term memory may become stronger.
Cells That Start A Human Life
Two cells - an ovum and a sperm.
One sperm fertilizes an ovum. After fertilization, the ovum divides itself into cells and then into four and so on. All the cells stay together in a ball of cells called morula. Morula then converts into a blastocyst which implants itself in the uterus and slowly becomes a fully grown fetus.
Life of a brain cell
Millions of cells die every second in our body and they are constantly replaced. Some cells in the gut have a life expectancy of about three days.
A brain cell can last for life. That is how we are able remember information for a long time.
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