Answer:Shelled organism, vertebrates, terrestrial life, age of fishes, swamp lands, reptiles
Explanation:
Shelled organism, vertebrates, terrestrial life, age of fishes, swamp lands, reptiles
Sinoatrial node part of the autonomic nervous system adjusts the heart rate and the arteriole diameter to regulate blood pressure through negative feedback
The SA (sinoatrial) node is generates an electrical signal that can causes the upper heart of the chambers (atria) to contract. The signal and then passes through the AV (atrioventricular) node to the lower of the heart chambers (ventricles), causing them to contract, or to pump. The SA node is considered the pacemaker of heart.
The sinus node continuously generates electrical impulses, thereby setting the normal rhythm and also rate in a healthy heart. Hence, the SA node is also referred to as the natural pacemaker of the heart
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Answer:
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Egypt's natural resources include petroleum, natural gas, phosphates, and iron ore. Crude oil is found primarily in the Gulf of Suez and in the Western Desert
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