Where does digestion begin in the digestive system?
Stomach
Esophagus
Small intestine
Oral cavity
The Correct Answer is D
Digestion begins in the oral cavity, also known as the mouth, where food is ingested and broken down into smaller pieces through mechanical digestion by the teeth and chemical digestion by enzymes in saliva, such as amylase. Once the food is sufficiently broken down, it forms a bolus and is then swallowed, passing through the esophagus and into the stomach. In the stomach, the food is further broken down by stomach acid and enzymes before passing into the small intestine for the absorption of nutrients.
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Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
The left ventricle of the heart normally has the thickest wall, which is composed mainly of cardiac muscle tissue (myocardium). The left ventricle has to generate enough force to pump oxygen-rich blood to the rest of the body through the systemic circulation, which requires greater muscular effort than the right ventricle, which pumps blood only to the lungs via the pulmonary circulation. The thickness of the left ventricular wall ensures that it can withstand the pressure required to generate this forceful contraction.
Correct Answer is B
Explanation
The urethra is a tube that connects the bladder to the external environment and serves as a passageway for urine to exit the body during urination. In males, the urethra also serves as a passageway for semen to exit the body during ejaculation, making it a part of both the male reproductive system and the urinary system.
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