Although children believe that "holding my breath until I die" is possible, why should parents not be concerned by this threat?
A) As a child holds his or her breath, oxygen levels build, stimulating breathing by the brain stem.
B) As a child holds his or her breath, oxygen levels decrease, stimulating breathing by the brain stem.
C) As a child holds his or her breath, carbon dioxide levels decrease, stimulating breathing by the brain stem.
D) As a child holds his or her breath, carbon dioxide levels increase, stimulating breathing by the brain stem.
D
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Mutations are important because they do what?
(A) provide variation that can result in evolutionary change. (B) occur in response to environmental demands. (C) are always beneficial in the individuals affected by them. (D) usually provide an individual with increased reproductive rates.
Which of the following lists correctly traces the path of a sound vibration as it moves through the ear?
A. auditory canal-tympanic membrane-malleus-incus-stapes-oval window-cochlea-cochlear nerve B. auditory canal-tympanic membrane-oval window-cochlea-malleus-incus-stapes-cochlear nerve C. auditory canal-malleus-incus-stapes-tympanic membrane-oval window-cochlea-cochlear nerve D. auditory canal-tympanic membrane-malleus-incus-stapes-cochlea-oval window-cochlear nerve E. auditory canal-malleus-incus-stapes-oval window-tympanic membrane-cochlea-cochlear nerve
One cell sends second messengers to another cell through gap junctions. What type of signaling would this be considered?
A. paracrine B. autocrine C. endocrine D. direct contact E. synaptic
The American Heart Association recommends a diet low in saturated fat and cholesterol to prevent which disease?
A. infarction B. hypotension C. hypertension D. atherosclerosis E. aneurysm