Which of the following is the most likely explanation for hypothyroidism in a patient whose iodine level is normal? a. greater production of T3 than of T4 b. hyposecretion of TSH c. hypersecretion of MSH d. a decrease in the thyroid secretion of calcitonin

Video transcript

Welcome back. Here's our next problem. An individual who had a severe iodine deficiency developed hypothyroidism. The five rock scene T. four level in their blood sample will be blank. And we have choices of high, low normal or normal to high. Well hypothyroidism um means alot level too low a thyroid hormone. And if we can't remember hypo or hyper we're gonna look here. We see this individual has severe iodine deficiency. Well thyroid hormone is in form of either T. Four or T three. T four being the most prevalent form throughout the body. And both of these are partly composed of iodine. So if we have an iodine deficiency we don't have enough iodine and that would necessarily result in low levels Of that T. four T. 3 because we don't have enough iodine for its composition. So when we look at our choices, we know that our answer would have to be choice be low. Because the deficiency of iodine would mean we don't have enough to make T. Four and T. Three. Hypothyroidism is low levels of thyroid hormone as we'd expect from that iodine deficiency, if we have trouble remembering hypo versus hyper, think of a hyper child having high energy. So in this case hypothyroidism, a low level of the thyroid hormone. So choice B is our answer. Low. See you in the next video