Which of the following is true of potassium ions?
a. they are actively secreted in the proximal tubule
b. their concentration is controlled by aldosterone
c. changes in concentration can affect membrane excitability
d. are reabsorbed in the distal tubule
e. both (b) and (c)
E
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Indicate whether the statement is true or false
Vasodilation in skeletal and cardiac muscle tissue results from the signal molecule _____ binding to ______ receptors
A. Epinephrine; beta 2 B. Epinephrine; alpha C. Acetylcholine; beta 2 D. Acetylcholine; alpha
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
The large holes within the leaky capillaries of the kidneys and intestines are known as:
a. micro pores b. macro pores c. Fick's funnels d. fenestrations e. capillary beds