The kidney tubular cells secrete NH3
a. when the urinary pH becomes too high
b. when the body is in a state of alkalosis
c. to buffer the acid phosphate excreted in the urine
d. when there is excess NH3 in the body fluid
e. to enable further renal secretion of H+
E
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Olfactory receptors are examples of
A) pain receptors. B) thermoreceptors. C) mechanoreceptors. D) chemoreceptors. E) proprioceptors.
Which of the following statements with regard to vision is FALSE?
A. Photoreceptors are neurons. B. There are two basic types of photoreceptors in the retina, rods, and cones. C. There are normally four different photopigments in the retina. D. There are four different chromophore molecules in the retina. E. There are four different opsins in the retina.
Hormones are examples of ________ secretion.
A) exocrine B) apocrine C) endocrine D) holocrine E) merocrine
The right ventricle has the thickest wall of the four heart chambers
Indicate whether the statement is true or false