The hypothalamus the hypothalamus functions only in neural transmission. controls most neuroendocrine signaling in mammals. secretes hormones that act directly on the gonads. functions only as an endocrine target. does not have any hormone receptors on its cells.

The complete list of answers :
A) functions only as an endocrine target, by having lots of receptors on its cells. 
B) functions only in neuronal transmission. 
C) does not have any hormone receptors on its cells. 
D) secretes tropic hormones that act directly on the gonads. 
E) includes neurosecretory cells that terminate in the posterior pituitary.

The correct answer is E.
The hypothalamus is a brain structure, that is made out of nerve cells. These cells participate in neuronal transmission, but some of them also have a secretory role and posses hormone receptor on their membranes. The secretory cells are connected to the posterior pituitary and modulate the activity of this endocrine gland, therefore affecting the whole endocrine system through the release of trophic hormones.

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A. convection currents in the mantle.is the correct answer