johan climbs mt. everest wearing a special outfit to withstand the very cold weather below 0 degree celcius . Explain how normal human body temperatures 37 degree celcius is maintained it johan is in the cool environment

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 correct answer is 2 and 4

what are the options? add them, then i will be glad to .