The muscle of the neck that is seen most posteriorly on axial CT images is the ____________________.
Fill in the blank(s) with the appropriate word(s).
erector spinae
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Stimuli for the activation of the RAAS pathway include
A) high blood pressure in the renal artery only. B) a decrease in fluid flow through the distal tubule only. C) low blood pressure in arterioles in the nephron and a decrease in fluid flow through the distal tubule. D) low blood pressure in arterioles in the nephron, a decrease in fluid flow through the distal tubule, and high blood pressure in the renal artery. E) low blood pressure in arterioles in the nephron only.
Which of the following is true regarding the parasympathetic innervation of the heart
a. it lowers heart rate below 100 beats per minute b. it innervates the ventricles c. it performs a similar action as the symp nervous system d. it decreases the force of contraction of the heart
Despite the fact that the partial pressure difference is so much smaller for CO2, why is there as much CO2 exchanged between the alveoli and blood as there is O2, ?
a) CO2 is much more soluble in blood than O2. b) The capillary walls are more permeable to CO2 than O2. c) CO2 is a smaller molecule and diffuses faster than O2.
What is the first structure in this respiratory sequence?
A) lungs B) trachea C) larynx D) pharynx