__________ and _________ are released by neurons

of the adrenal medulla and cause a fight–flight
response as does stimulation by the sympathetic
nervous system. Fill in the blank(s) with the appropriate word(s).


Answer: Norepinephrine; epinephrine

Biology & Microbiology

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The sphincter between the esophagus and the stomach serves to ________

a. produce digestive enzymes b. generate peristalsis to propel food c. block the flow of substances when it is contracted d. produce bile

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In the central nervous system messages are coordinated and integrated and instructions are sent via nerves to ______.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

The three functions of blood are transportation, protection, and ________

Fill in the blank(s) with correct word

Biology & Microbiology

Which of the following statements is false?

a. There are more than 1,000 chromosomes found in some organisms. b. The more highly evolved a species is, the more chromosomes it possesses. c., The number of chromosomes remains constant throughout a life cycle. d. The number of chromosomes is the same for all members of a species. e. There are half as many chromosomes in germ cells as there are in somatic cells

Biology & Microbiology