BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Answer and Explanation: The parathyroid gland is stimulated by the a)humoral stimulus. The parathyroid glands secrete the PTH which helps in the regulation of the calcium levels of the body.

Detailed explanation-2: -Low calcium levels in the blood stimulate parathyroid hormone secretion, whereas high calcium levels in the blood prevent the release of parathyroid hormone.

Detailed explanation-3: -A rise in blood glucose levels triggers release of insulin from the pancreas. This mechanism of hormone production is stimulated by: humoral stimuli.

Detailed explanation-4: -Parathyroid hormone is secreted by the four parathyroid glands. These tiny glands are present in the neck behind the thyroid glands. Parathyroid hormone controls and regulates the levels of calcium in the blood and raises their levels when they are too low.

Detailed explanation-5: -Endocrine Gland Stimuli Humoral stimuli are changes in blood levels of non-hormone chemicals that cause the release or inhibition of a hormone to maintain homeostasis. For example, osmoreceptors in the hypothalamus detect changes in blood osmolarity (the concentration of solutes in the blood plasma).