What ion is sometimes used as a second messenger of amino acid based hormones?

What ion is sometimes used as a second messenger of amino acid based hormones?

A) iron
B) calcium
C) sodium
D) chlorine

Answer: B

How do glucocorticoids enable the body to deal appropriately with stress?

How do glucocorticoids enable the body to deal appropriately with stress?

A) by increasing blood glucose, fatty acid, and amino acid levels and enhancing blood pressure
B) by decreasing the heart rate, thus decreasing blood pressure
C) by stimulating the pancreas to release insulin
D) by blocking the neurotransmitters that prepare the body for the stress response

Answer: A

Thyroxine is a peptide hormone, but its mechanism is different from other peptide hormones. Which of the following statements is true concerning this difference?

Thyroxine is a peptide hormone, but its mechanism is different from other peptide hormones. Which of the following statements is true concerning this difference?

A) It causes positive feedback.
B) It does not require a second messenger to effect a response.
C) It is very specific in the cell type it targets.
D) It is a stimulant of cellular metabolism and targets all cells.

Answer: B

Which of the following organs is affected by thyroid hormone in adults?

Which of the following organs is affected by thyroid hormone in adults?

A) liver
B) spleen
C) thyroid gland
D) brain

Answer: A