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 A
Explanation
Also known as platelets, are cell fragments in the blood that play a crucial role in blood clotting or coagulation. When a blood vessel is injured, thrombocytes are activated and clump together to form a platelet plug that stops the bleeding. They also release substances that promote blood clotting and help to repair the damaged blood vessel. Therefore, the function of thrombocytes is important in preventing excessive bleeding and promoting wound healing. Options a, c, and d are incorrect because they do not describe the function of thrombocytes.
Correct Answer is A
Explanation
Ceruminous glands are specialized sweat glands located in the skin of the ear canal. These glands secrete a waxy substance called cerumen or ear wax. Ear wax helps to lubricate and protect the skin of the ear canal and prevent the entry of foreign particles, such as dust and insects, into the ear. It also has antibacterial properties that help to protect the ear from infection. The amount and composition of ear wax vary from person to person and can be affected by factors such as age, genetics, and environmental conditions.
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