The testes originate from tissues posterior to the parietal pleura
Indicate whether the statement is true or false
FALSE
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The all-or-none principle states that
A) all stimuli will produce identical action potentials. B) all stimuli great enough to bring the membrane to threshold will produce identical action potentials. C) the greater the magnitude of the stimuli, the greater the magnitude of the action potential. D) only sensory stimuli can activate action potentials. E) only motor stimuli can activate action potentials.
Which type of allergic reaction is the most common type?
a) Type I (anaphylactic) reaction b) Type II (cytotoxic ) reaction c) Type III (immune-complex) reactions d) Type IV (cell-mediated) reactions e) All of these types are common allergic reactions.
138) Excitatory neurotransmitters of the CNS usually act by opening ________ channels.
A) Ca2+ B) Cl- C) H+ D) K+ E) Na+
Which vessels empty blood into the left atrium?
A. aorta B. right atrium C. pulmonary trunk D. pulmonary arteries E. pulmonary veins