4. All the endocrine systems are organized in a manner that permits them to carr

Question

4. All the endocrine systems are organized in a manner that permits them to carry out their function: control the bodily activity to maintain homeostasis. Such systems respond to disturbances so as to minimize the effect of these disturbances on the system's regulated variables Figure 1 below is a diagram of a hypothetical endocrine control system. The following abbreviations are used here and in the figure; H = the hormone product of the endocrine cell X a normal stimulus to the endocrine cell The lowercase letters in the figure refer to the situation defined below. Determine the consequence of each situation on the hormone concentration in the blood (TH1l and the hormone EFFECT. As used here, EFFECT is a gross action of the hormone. For example, an EFFECT of insulin is to reduce the plasma glucose concentration. Assume that the condition described in each situation is maintained for a long time. Predict the changes you would expect to occur in each situation immediately. Use increase, decrease or no change. Provide a short explanation for your prediction. Situation Immediate Consequences EFFECT a. C.

Explanation / Answer

X H Effect

Low blood pressure Adrenalin Increase secretion of adrenalin stimulates symphathetic effect which raises the blood pressure Low plasma glucose level Insulin Decrease secretion of insulin which in turn raise the blood glucose level. High T3 and T4 blood level Thyroid stimulating hormone (TSH) Decrease secretion of tsh which in turn normalise the T3 and T4 levels in blood

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