__________ 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
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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
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).
The three functions of blood are transportation, protection, and ________
Fill in the blank(s) with correct word
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