Which cardiac chamber has the thinnest wall and why?
The right and left atria because they are low pressure chambers that serve as storage units and conduits for blood.
The right and left atria because they are not involved directly in the preloaded, contractility or afterload of the heart
The left ventricle because the mean pressure of blood coming into the ventricle is from the lung, which has a low pressure
The right ventricle because it pumps blood into the pulmonary capillaries, which have a lower pressure compared with the systemic circulation
The Correct Answer is A
The walls of the atria are thin because they do not generate as much pressure as the ventricles, as their main function is to receive blood from the veins and pump it into the ventricles. The ventricles have thicker walls because they are responsible for generating the force necessary to pump blood out of the heart and into the systemic or pulmonary circulation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
IgE is the immunoglobulin associated with allergic reactions and is often elevated in patients with asthma. When a person with asthma is exposed to an allergen, their IgE levels increase, leading to the release of inflammatory chemicals such as histamine, which can cause bronchoconstriction and other symptoms of asthma.
IgA: This is an immunoglobulin that plays a role in the immune system's defense against infections. It is mainly found in the mucous membranes of the respiratory and gastrointestinal tracts.
IgG: This is the most abundant immunoglobulin in the bloodstream and plays a role in providing immunity against bacterial and viral infections. It can also cross the placenta and provide passive immunity to a developing fetus.
IgM: This is the first immunoglobulin produced in response to an infection and plays a role in the body's defense against bacterial and viral infections. It is found primarily in the bloodstream.
Correct Answer is A
Explanation
Primary hypertension, also known as essential hypertension, refers to high blood pressure that has no identifiable underlying cause. Risk factors for developing primary hypertension include a family history of hypertension, age, obesity, smoking, sedentary lifestyle, stress, and certain dietary factors.
Specifically, diabetes mellitus is a risk factor for hypertension due to the effects of insulin resistance and hyperinsulinemia on the blood vessels, as well as the increased prevalence of obesity and other comorbidities. Moderate alcohol consumption (up to 1 drink per day for women and up to 2 drinks per day for men) may actually have a protective effect against hypertension, but excessive alcohol intake can raise blood pressure and contribute to the development of hypertension.
Asian race is not a significant risk factor for primary hypertension, although there may be differences in the prevalence and severity of hypertension among different racial and ethnic groups.
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