"Drugs that have been made to act on the same nervous system receptors as opiates are called ."

Answer is opioids.

Explanation:

The opioids are drugs like opiums, and perform similar function like opium.

They are useful for the treatment of moderate and severe pain by acting on opioid receptors. The drug is also usuf in suppressing cough and diarrhea. It has side effects like sedation and nausea.

It should be noted that, a long term exposure to this drug can lead to drug tolerance, ahich can be described as physical tolerance and probably , withdrawal symptoms. Example is narcotics.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.