Before the discovery of these glands, thyroid surgery often led to a rapid drop in blood calcium levels, which triggered muscle contractions and cardiac arrhythmias. what glands are these and which hormone is lacking? thyroid glands; levothyroxine parathyroid glands; calcitonin parathyroid glands; levothyroxine parathyroid glands; parathyroid hormone thyroid glands; calcitonin

Answer;

C) parathyroid glands; parathyroid hormone

Explanation;

-Parathyroid glands (humans, four) are imbedded in the thyroid gland and they secrete the parathyroid hormone (PTH). So-called C cells dispersed throughout the thyroid gland, the parathyroids and thymus secrete another hormone, calcitonin. Both hormones play a significant role in the maintenance of calcium homeostasis.

-PTH, a polypeptide secreted in response to hypocalcemia raises the concentration of plasma calcium by;  increasing renal calcium reabsorption, mobilizing calcium from bones by stimulating osteoclastic activity, in the presence of adequate amounts of vitamin D, stimulating the absorption of calcium from the small intestine; and lowering levels of plasma inorganic phosphate by inhibiting renal reabsorption of phosphate

sexual reproduction produces offspring with novel combinations of genes. species that reproduce sexually must maintain two different types of individuals, males and females, which can limit the ability to colonize new habitats as both sexes must be present.

the answer is b

explanation: