Which of the following statements concerning the type of support illustrated in Figure 40-2 is false?
a. It is flexible.
b. It can be found in cnidarians.
c. It demonstrates cells working in an antagonistic fashion.
d. It it absent in vertebrates that have an endoskeleton.
e. It is dependent on fluids being noncompressible.
D
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Which of the following statements is false regarding RSV?
A. RSV infects infants aged 6 months and younger; it is unlikely that a 4-year-old would develop a respiratory disease as a result of this virus. B. While RSV is most prevalent in infants 6 months of age and younger, the highest mortality rate is in those children with underlying risk factors such as prematurity. C. Infants aged 6 months and younger are the most susceptible to infection by RSV; however, adults and older children can also become infected with this virus. D. Although RSV is most prevalent in infants aged 6 months and younger, usually by age 2 most children have been exposed to this virus.
Which of the following is true of the myelin sheath?
a. It is produced by glial cells b. It increases the speed of signal conduction along the axon c. It saves energy d. All of the above
what gas is used to sterilize catheters and rubber tubbing in hospitals?
What will be an ideal response?
Hormones are released from one cell and act on other cells in distant organs and are thus an example of
A. intercellular signaling. B. paracrine signaling. C. autocrine signaling. D. contact-to-contact signaling. E. endocrine signaling.