The innermost (most anterior) layer of the retina consists of
A. the pigmented epithelium.
B. nerve fibers of the ganglion cells.
C. bipolar neurons.
D. rods and cones.
E. amacrine cells.
Answer: B
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Which structure(s) of the respiratory system contain(s) C-rings or plates of hyaline cartilage, to prevent airway collapse?
A. The trachea, bronchi, and all of the bronchioles B. The bronchi only C. The trachea and bronchi D. The trachea only E. The nasal cavity
The presence of acid and peptides in the stomach stimulates the gastric phase of gastrointestinal control.
Answer the following statement true (T) or false (F)
2,3-diphosphoglycerate
a. is produced within red blood cells b. production is inhibited by HbO2 c. concentration gradually increases when Hb in the arterial blood is chronically undersaturated d. can bind with Hb e. has all of the above characteristics
Which of the following is NOT a function of neuroglia?
A. Help nourish neurons B. Modify the extracellular environment of neurons C. Conduct impulses to effectors D. Bind neurons together