All of the below are sensory stimuli that can stimulate respiratory reflexes except
A) stretch receptors.
B) nociceptors.
C) chemoreceptors.
D) baroreceptors.
E) irritant chemical or physical particles.
Answer: B
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The axis is C1.
Answer the following statement true (T) or false (F)
The only role of modulator molecules is to enhance the binding affinity of the functional site of an allosteric protein.
Answer the following statement true (T) or false (F)
Arrange the following events of exocytosis in the correct sequence:(1) Vesicle membrane fuses with plasma membrane(2) Secretory vesicles migrate to plasma membrane(3) Vesicle contents are expelled from cell(4) Secretions accumulate within secretory vesicles
A. 1, 2, 3, 4 B. 2, 1, 4, 3 C. 4, 2, 1, 3 D. 1, 4, 2, 3 E. 3, 1, 4, 2
Contraction of the papillary muscles would
A. eject blood from the ventricles. B. prevent the AV valves from protruding into the atria. C. close the semilunar valves. D. cause the atria to eject their contents into the ventricles. E. open the semilunar valves.