Mr. jansen lived in wisconsin and had an enlarged thyroid gland, or endemic due to a deficiency of in the diet, common among peoples in his geographic region of the state.

Goiter/Hypothyroidism ║Iodine

Explanation:

Goiter is the swelling of the thyroid gland due to a lack of Iodine in the diet, it is common in people that live in rural areas, mostly in mountain regions, that don't have access to iodine-rich foods in their diet. Nowadays is not that common, since table salt is enriched with iodine.

the most speciallized is b. grizzly bear

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.