The invertebrate hormone prothoracicotropic hormone (PTTH)
A) is secreted from glands in the thorax.
B) integrates information detected by the brain with the control of molting.
C) plays no role in molting and metamorphosis.
D) is secreted only in adulthood.
E) is required in large quantities to have an effect.

Question

Quizplus · Accepted Answer

PTTH is a hormone secreted by the brain that plays a critical role in coordinating the timing and control of molting and metamorphosis in invertebrates. It integrates information from various sensory organs in the insect's body, including light cues and hormonal signals, to determine the appropriate timing for molting and growth. Without PTTH, insects would be unable to coordinate their growth and development properly, leading to abnormalities and potential death.

The Invertebrate Hormone Prothoracicotropic Hormone (PTTH)