the heart bea increase in joy by the efeect of
/sino atrial node/atrio ventrical node/nerve connected to the heare/all the previous

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nerve connected to the heart sympthatic nerve والله اعلم

sino atrial node

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sino atrial

the sympathetic nerve increases the rate of sinoatrial node increasing the rate of heart beats. so the answer is the nerve

ارجوكم اجابة امتحان البايولجى لعام2010

ارجوكم نموذج اجابة امتحان البايولجى لعام2010

sympathtic nerve

nerve connected to the heart ( Sympathetic Nerve )

All The Previous
لأن الـNerve send Impulses to Sino atrial node and atrio venticular node recieve it and send it to the walls of ventricles through elastic fibres
يبقى الاجابة all the previous
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تحياتى للجميع

sino atrial node where it is connected to two nerves vagus nerve and sympathetic nerve
واحد فيهم كان بيزود ضربات القلب و واحد بيقللها بس الحقيقه مش عارفه بس انا متأكده من الي قلته

Sino Atrial Node : The hearts beats starts from it
Atrial Ventricular Node : Send nerves impulses
BUT, The Nerve which is responsible for increasing the heart beats is SYMPATHETIC NERVES .. While The VAGUS NERVE is responsible for decreasing it