Heartburn is caused by the ____
a. gastroesophageal sphincter remaining too tightly closed
b. gastroesophageal sphincter remaining a bit open
c. pyloric sphincter remaining too tightly closed
d. pyloric sphincter remaining a bit open
e. the gastroesophageal and the pyloric sphincters remaining too tightly closed
ANSWER: b
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Which statement is correct regarding microbial growth on food at refrigeration temperatures?
A. The absence of light in the refrigerator greatly reduces the growth of most microbial pathogens. B. There is no growth of microbes in food in the refrigerator; the cold temperature kills or inactivates microbial cells. C. Most food does not have enough oxygen content for microorganisms to thrive. D. The growth of microbes in food depends on their optimal growth temperature; some grow slowly and others faster.
The naming system developed by Linnaeus is called:
a. clamadics b. phylogeny c. binomial nomenclature
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.
Membrane delimited intracellular structures that perform specific functions in cells are called ________.
A. organs B. organelles C. systomis D. tissues