16C homework

Which gland secretes the most important hormone controlling calcium balance in the blood?

parathyroid

The single most important regulator of calcium levels in the blood is ________.

parathyroid hormone

Which of the following is NOT a step in thyroxine (T4) production?

the diffusion of iodide from blood plasma into the follicular cell

Hypocalcemia could be caused by the ______. apoptosis of parathyroid cells failure of osteoclasts to respond to PTH (parathyroid hormone/parathormone) malfunction of the parathormone receptors in kidney tubule cells All of the listed responses are correct.

All of the listed responses are correct.

You may predict that iodized salt may be effective in preventing all EXCEPT which of the following?

Graves' disease

A patient is being treated by her urologist for a fourth episode of kidney stones. Analysis of the stones shows that they are composed of calcium oxalate. The urologist orders an assay of which hormone?

Parathyroid hormone (PTH)

Which of the following would result from hypoparathyroidism?

a decrease in the release of calcium from bones

What hormone is released by the cells pictured in letter D?

calcitonin These humorally-stimulated cells respond to increasing levels of calcium in the blood and secrete calcitonin to counteract it.

Calcitonin is the main regulator of blood calcium levels.

false

Thyroid hormone production requires the presence of both iodine and calcium.

false

What type of cell is shown at letter C?

follicular cells

What type of stimulation controls parathyroid release?

humoral

Which of the following is NOT a parathyroid gland mechanism to maintain adequate levels of blood calcium?

inhibition of calcitonin synthesis

What material is stored in the lumen of the thyroid follicle?

iodinated thyroglobulin, from which thyroid hormone can be produced