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 When does a fetus have a functioning heart?

Answer In normal fetal development, the heart and circulatory system begin forming during the first four weeks after conception. During week five, the fetus's heart is developed and functional enough to b... Read More »
http://www.answerbag.com/q_view/1960071

Top Q&A For: When does a fetus have a functioning heart

Is 52 a low heart beat ... was is considered a normal heart beat im 22 yrs old?

Well if you are a athlete it is normal, otherwise at this heart rate you will be facing symptoms like vertigo, faintness. Even if not see your doctor.
http://answers.yahoo.com/question/index?qid=20080820140709AAyuoVC

Is it normal for my heart to beat rapidly when I'm tired?

If you have been exerting yourself, sure it is normal. If you are resting (but tired) you may have arythmia, which makes your heart beat faster. See a doctor if it is something that is bothering ... Read More »
http://answers.yahoo.com/question/index?qid=20080103134429AAd6fBl

Why does my heart beat fast when I wake up?

It's quite normal. While you are sleeping your pulse rate and BP's go down to incredibly low figures, because all your organs need very little blood to keep them ticking over.When wakening, and ris... Read More »
http://answers.yahoo.com/question/index?qid=20080616230700AAEiE0G

Why does your heart beat faster when you get nervous?

When you get nervous, it sets off a bunch of chemicals in your system--these include: epinephrine, adrenaline and cortisol. All of these chemicals cause your system to become highly charged. Not on... Read More »
http://answers.yahoo.com/question/index?qid=20080514155449AAY5SvI


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