anatomy and physiology mcqs

Question #341

Which of the following is true of saliva formation?

Saliva is formed by a process of active secretion followed by selective modification as is passes along the duct. As a secreted, rather than a filtered, product its rate of formation is independent of arterial blood pressure over the physiological range.

The primary secreted product closely resembles plasma in its composition. At high flow rates there is less opportunity for its composition to be modified, resulting in the final saliva composition closely resembling that of plasma.

Both sympathetic and parasympathetic activity promote salivary formation.

Myoepithelial cells are not present in the pancreas.

Kallikrein has a trivial role in facilitating saliva production in all species studied, with the exception of the ferret.

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