If the H+ concentration in the blood increases, bicarbonate ions act as buffers by
A. dissociating into H+ and CO3?.
B. releasing H+ into the plasma.
C. combining with Cl?.
D. removing excess H+ from the plasma.
E. combining with hemoglobin.
Answer: D
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a. is perceived in the optic chiasma but is interpreted in the primary visual cortex b. depends on various ratios of stimulation of the three cone types in response to different wavelengths of light c. is usually lost in vitamin A deficiency d. depends on activation of a specific cone for each visible color e. is made possible by convergence within the cone pathways
What is the role of tropomyosin in a sarcomere?
A. It is the main protein component of thin myofilaments. B. It is the main protein component in thick myofilaments. C. It blocks the active sites on actin filaments in relaxed muscle fibers. D. It binds to calcium to initiate muscle contraction. E. It is the main component of elastic filaments.
What type of specialized epithelium makes up the mucous coat of the ureter and urinary bladder?
A. Stratified squamous epithelium B. Transitional epithelium C. Pseudostratified ciliated columnar epithelium D. Simple cuboidal epithelium E. Simple columnar epithelium
Which portion of the kidney delivers urine to the ureter?
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