The Hypothalamo-Hypophyseal Portal System

question 21

Multiple Choice

The hypothalamo-hypophyseal portal system

• A) carries anterior pituitary hormones from the anterior pituitary gland to the hypothalamus to regulate the release of hypophysiotropic hormones
• B) diverts blood directly to the pituitary, completely bypassing the hypothalamus
• C) carries hypophysiotropic hormones from the hypothalamus to the anterior pituitary to regulate anterior pituitary hormone secretion
• D) carries the anterior pituitary hormones into the general systemic circulation
• E) connects the hypothalamus and posterior pituitary

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Definitions:

On-Center

On-Center describes a type of neuronal response characterized by activation when the center of its receptive field is stimulated by light, while stimulation of the surrounding area inhibits activation.

Off-Surround

A concept in visual processing referring to the inhibitory mechanism surrounding the central point of stimulation, enhancing edge detection and contrast in visual perception.

Color Opponent Retinal Ganglion Cell

Color opponent retinal ganglion cells are neurons in the eye that help in the processing of color vision by responding differently to light from different parts of the color spectrum.

Glaucoma

A group of eye conditions that damage the optic nerve, often caused by abnormally high pressure in the eye, leading to loss of vision.