Answer:With this system, blood always flows in only one direction inside the heart. There are also valves at the bottom of the large arteries that carry blood away from the heart: the aorta and the pulmonary artery. These valves keep the blood from flowing backward into the heart once it has been pumped out.

Explanation:

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Students who suffer from test anxiety often have some of the following symptoms: the need for frequent urination, dilated pupils

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Answer:

It Is the sympathetic Nervous System.

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3 years ago

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On saturday night, robert notices a minor but unusual pain in his right leg. after researching what this could be on the interne

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