Smokers on sperm production, maturation and distortion has obvious effect, smoking time is longer, the more abnormal sperm, the normal sperm count also decreases ceaselessly, sperm activity will be reduced, such as adult male smoking 30 cigarettes a day, sperm survival rate of 40%%, no doubt on the fertility of adverse;
The United States Baylor College of Medicine ( Baylor College of Medicine ) researchers say, cigarettes addictive composition -- nicotine ( nicotine )," trick " the brain to smoking behavior and the environment combine. The findings were published in a recent issue of the journal" neurons" ( Neuron ).
Why has the smoking habits of people in a bar or a dinner with friends want to suck
" Our brains are usually will be beneficial to the survival and development of our events and environmental conditions when together, so we again performed this act, which allows us to success in life. When we do a bad thing, the brain will send a reward signal." Baylor College of Medicine neuroscience professor John A . Dani said, he is also one of the authors of the report. " Then, nicotine has borrowed the subconscious brain learning process, make us think that smoking is also positive behavior."
Dani said, and smoking linked to environmental conditions may cause we have strong suction on a desire. These cues may include alcohol, dinner with friends, or even from the company to drive home. In order to understand why this is so strong, Dani and Baylor College of Medicine neuroscience lecturer, this study co-author Jianrong Tang, going through the record mouse received nicotine, their brain activity.
In experiment, mice were placed into two separate cell test equipment, it can in the two cell in the random walk. Among them a cell, it will accept to nicotine, another room, they can get the harmless salt solution. Then, researchers recorded the mice in each room to stay longer, and to record the mouse brain to generate new memory hippocampus activity.
" Test in mouse brain activity changes in surprise," Dani said," nicotine forcing neuron connection number is the injection of saline solution 200%. This strong connection is a new memory form the foundation." Therefore, compared to only give salt solution room, the mouse learning to spend more time in nicotine room.
" We found only in commonly called brain reward centers where the sending of a dopamine signaling, nicotine can induce neuronal synaptic connections. It is a new memory key process, even like smoking 's bad behavior is no exception."
Dani said, understanding of the way of memory, is conducive to future research on memory disorder measures, such as Alzheimer's disease ( Alzheimer s disease ), or Parkinson's disease ( Parkinson s disease ) as dopamine signaling disorders.