Breathing muscles such as the diaphragm are controlled by neurons of the _________ nervous system
A. somatic
B. autonomic
C. enteric
A
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Which of the following statements is most correct regarding the intracellular chemical signals known as "second messengers"?
A) Second messengers usually inactivate protein kinase enzymes. B) Second messengers usually act to remove nitric oxide (NO) from the cell. C) Cyclic AMP and calcium may be second messengers. D) Second messengers act through receptors called K-proteins.
Bile consists of all of the following except:
a. lipase b. alkaline fluid c. bile salts d. lecithin e. bilirubin
Why does exposure to sunlight or sunlamps darken skin?
A) UV radiation stimulates melanocytes to produce more melanin. B) UV radiation stimulates melanocytes to produce more melatonin. C) UV radiation stimulates keratinocytes to produce more carotene. D) UV radiation stimulates keratinocytes to produce more keratin. E) UV radiation stimulates melanocytes to produce more melanin and keratinocytes to produce more keratin.
A portion of a cell's plasma membrane is removed during endocytosis
Indicate whether the statement is true or false.