Which of the following is not a means by which viruses can lead to cellular damage or death?
a. release by the virus of enzymes or toxins that physically injure or disrupt affected cells
b. depletion of essential cellular components by the virus
c. cellular production of substances toxic to the cell under the dictatorship of the virus
d. transformation of normal host cells into cancer cells
e. incorporation of the virus into the cell so that the body's own defense mechanisms no longer recognize the cell as part of "normal self" and destroy it
A
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During an action potential _______
Fill in the blank(s) with the appropriate word(s).
The town of Nederland, Colorado, has a winter festival called Frozen Dead Guy Days. A man named Bredo Morstoel, a native Norwegian, was born in 1900 and died in 1989. After his death, his grandson had his body cryogenically frozen and stored it in a shed in Colorado until a future date when he supposedly will be resuscitated. Why will this thawing procedure NOT bring Mr. Morstoel back to life?
a. freezing temperatures cause water to expand, which would burst cell membranes b. death had already occurred before the freezing process c. the ratio of surface area to volume is low in Mr. Morstoel's body, meaning that ice crystals would have formed during the freezing process d. all of the above
An unmyelinated nerve fiber conducts an impulse over its entire length with a slower rate of conduction than that of a myelinated fiber
a. True b. False Indicate whether the statement is true or false
Haversian canals are a key feature of compact bone.
Answer the following statement(s) true (T) or false (F)