18 Questions
What is the primary function of the digestive system?
Transfer nutrients, H2O, and electrolytes from food into the body's internal environment
What occurs in the small intestine?
Absorption of digested food from GIT lumen into blood or lymph
What is the function of digestive enzymes?
To break down complex molecules into simple absorbable units
What is the role of gut motility?
To mix food with digestive juices and to move food forward
What is the structure that includes the mouth, pharynx, esophagus, stomach, small intestine, large intestine, and anus?
Gastrointestinal tract
What is the role of salivary glands?
To secrete digestive enzymes
Which type of muscle contraction is involved in the movement of food in the digestive tract, except at the oral and anal ends?
Smooth muscle
What is the primary function of amylase in saliva?
Breakdown of starch
What is the main purpose of propulsive (peristaltic) movement in the gut?
Forward movement of food through the digestive tract
What is the percentage of water in saliva?
99.5%
Which of the following is a function of saliva in oral hygiene?
Keeping the mouth and teeth clean
What is the role of lysozymes in saliva?
Proteolytic activity
What is the primary function of lysozyme in saliva?
To attack and break down bacteria
What type of receptors are found in the pharynx and stimulate the swallowing reflex?
Touch receptors
What is the role of thiocyanate ions in saliva?
To destroy bacteria
What is the consequence of a lack of salivation?
Oral tissues become ulcerated and infected
What is the correct sequence of events in the mechanism of swallowing?
Oral, pharyngeal, involuntary
What type of nerves are involved in the efferent pathway of the swallowing reflex?
Parasympathetic nerves
Learn about the functions of the digestive system, regulation of gut functions, and the roles of salivary glands. This quiz covers the basics of the gastrointestinal tract, including the mouth, pharynx, esophagus, stomach, small intestine, and large intestine.
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