The heart is essentially in the middle of the chest, has a broad base at the top and tapers to a pointed tip, the apex, at the bottom
a. True
b. False
Indicate whether the statement is true or false
True
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Polysynaptic reflexes can produce far more complicated responses than monosynaptic reflexes because
A) motor neurons carry impulses at a faster rate than do sensory neurons. B) the interneurons involved can trigger many muscle groups. C) the response time is quicker. D) interneurons speed up processing. E) the response is initiated by highly sensitive receptors.
Extracellular messengers binding on surface receptors may exert effects on cells via all the following means, except:
a. opening gated channels. b. opening a gated channel through activation of a G protein. c. activation of the adenylyl cyclase system. d. binding to sites and then being endocytized. e. ultimately activating protein kinases.
What learning modality is engaged when students participate in study groups?
A) auditory learner B) kinesthetic learner C) visual learner D) tactile learner
Cytotoxic T-lymphocytes destroy infected cells by releasing
A. bradykinin and histamine. B. perforin and granzymes. C. antibodies. D. CD4+.