Increased testosterone levels reduce the secretion of gonadotropin-releasing hormone from the anterior pituitary. This is an example of
A. inhibition of hormone release by hormonal stimuli.
B. inhibition of hormone release by external stimuli.
C. inhibition of hormonal release by environmental stimuli.
D. inhibition of hormone release by humoral stimuli.
E. inhibition of hormone release by neural stimuli.
Answer: A
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Indicate whether the statement is true or false
The lens
A. is biconcave. B. focuses light on the retina. C. is normally opaque. D. is attached to the retina by suspensory ligaments. E. floats in the vitreous humor.
This portion of the brain secretes the hormone melatonin, which helps to regulate the body's circadian rhythm.
A. Anterior nucleus B. Mammillary body C. Pineal gland D. Habenular nucleus E. Paraventricular nucleus
As a runner sprints down a track, her movement is an example of
A. potential energy. B. mechanical energy. C. heat. D. radiant energy. E. chemical energy.