The relationship between the insect hormones ecdysteroid and PTTH is an example of
A) an interaction of the endocrine and nervous systems.
B) homeostasis achieved by positive feedback.
C) how peptide-derived hormones have more widespread effects than steroid hormones.
D) homeostasis maintained by antagonistic hormones.
E) competitive inhibition of a hormone receptor.

Question

Quizplus · Accepted Answer

The relationship between ecdysteroid and PTTH involves the endocrine and nervous systems. Ecdysteroid is produced by the prothoracic gland in response to PTTH signals from the brain. This interaction between the two systems is an example of how they can work together to control physiological processes in insects.

Alternatively,

Answer: D
 Ecdysteroid and PTTH are antagonistic hormones that work together to maintain homeostasis in insects. PTTH stimulates the production of ecdysteroid, which then induces molting and metamorphosis. Once the appropriate level of ecdysteroid is reached, it inhibits the production of PTTH to prevent overstimulation of molting and ensure proper growth and development.

The Relationship Between the Insect Hormones Ecdysteroid and PTTH Is