Which is true?
-The pineal gland, located within the brain's two hemispheres, receives signals from the SCN and decreases production of the hormone melatonin, which helps put you to sleep once the lights go down.
-The pineal gland, located within the brain's two hemispheres, receives signals from the SCN and increases production of the hormone GABA, which helps put you to sleep once the lights go down. -The pineal gland also governs functions that are synchronized with the sleep/wake cycle, including body temperature, hormone secretion, urine production, and changes in blood pressure.
-The pineal gland rests in a part of the brain called the hypothalamus, just above the point where the optic nerves cross. Light that reaches photoreceptors in the retina (a tissue at the back of the eye) creates signals that travel along the optic nerve to the pineal gland.
The pineal gland, located within the brain's two hemispheres, receives signals from the SCN and decreases production of the hormone melatonin, which helps put you to sleep once the lights go down.
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What function does a clitellum serve?
a. anchoring an animal to its substrate b. digestion c. cushions organs d. glues two organisms together for sperm exchange e. keeps blood from clotting
In a normal, healthy individual, at which time would cortisol secretion be highest?
a. early morning b. late morning c. mid-day d. evening e. middle of the night
Increased species diversity among many species groups in the tropics (as compared to higher latitude regions) appears to be the result of a greater variety of ecological resources.
a. true b. false
Similar body parts are not always homologous. They may have evolved independently in separate lineages as adaptations to the same ____.
A. reproductive isolation of these groups B. environmental pressures C. reduced genetic variability in these groups D. identical genes in all three groups E. genetic bottleneck