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Chapter 36: Q.35 (page 1047)

How could the pineal gland, the brain structure that plays a role in annual cycles, use visual information from the suprachiasmatic nucleus of the hypothalamus?

Short Answer

Expert verified

c

Step by step solution

01

Step 1. Introduction

The pineal gland's primary job is to gather information from the environment about the condition of the light-dark cycle and transmit it so that the hormone melatonin can be produced and secreted. The internal circadian clock's phase is frequently determined by the rhythmic generation of melatonin, which is only released throughout the night.

02

Step 2. Detailed explanation

In humans, the pineal gland is a tiny, heavily vascularized, secretory neuroendocrine organ. It is situated in the middle of the brain, outside of the blood-brain barrier, and has a small stalk that connects it to the third ventricle's roof. The pineal gland in humans typically exhibits some degree of calcification with aging, serving as a useful imaging marker.

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Most popular questions from this chapter

A satellite is launched into space but explodes after exiting the Earth鈥檚 atmosphere. Which statement accurately reflects the observations made by an astronaut on a space walk outside the International Space Station during the explosion? a. The astronaut would see the explosion, but would not hear a boom. b. The astronaut will not sense the explosion. c. The astronaut will see the explosion, and then hear the boom. d. The astronaut will feel the concussive force of the explosion, but will not see it.

Benign Paroxysmal Positional Vertigo is a disorder where some of the calcium carbonate crystals in the utricle migrate into the semicircular canals. Why does this condition cause period of dizziness? a. The hair cells in the semicircular canals will be constantly activated. b. The hair cells in the semicircular canals will now be stimulated by gravity. c. The utricle will no longer recognize acceleration. d. There will be too much volume in the semicircular canals for them to detect motion.

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In what way does the overall magnitude of a stimulus affect the just-noticeable difference in the perception of that stimulus?

All sensory signals except _____ travel to the _____ in the brain before the cerebral cortex. a. vision; thalamus b. olfaction; thalamus c. vision; cranial nerves d. olfaction; cranial nerves
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