Explain why adrenaline has opposite effects on the blood vessels of the gut and the muscles ​

Main effects of adrenaline exerted on smaller arterioles and precapillary sphincters although veins and large arteries also respond to the drug. It constricts vessels of skin & mucus (mucous) membrane. It dilates BV of skeletal muscles. Thus net results of this is, decrease in the peripheral resistance.

Explanation:

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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.

the endomembrane system i think