What cavity of the heart normally has the thickest wall?
Left atrium.
Left ventricle.
Right ventricle
Right atrium
The Correct Answer is B
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
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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Correct Answer is D
Explanation
A ball and socket joint is a type of synovial joint where the rounded head of one bone fits into the concave socket of another bone, allowing movement in multiple directions. The shoulder joint is a classic example of a ball and socket joint, where the rounded head of the humerus bone fits into the shallow socket of the scapula bone, allowing for a wide range of movements such as flexion, extension, abduction, adduction, and rotation. The ankle joint is a hinge joint, the elbow joint is a hinge joint, and the knee joint is a complex hinge joint.
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