Explain the benefit of anastomoses in coronary artery circulation
What will be an ideal response?
Anastomoses are systems of channels formed between blood vessels. Coronary arteries may form anastomoses with one another, with branches from the pericardium, or even with arteries outside the coronary circulation entirely. The benefit of anastomoses in coronary circulation comes when blood flow to the myocardium is insufficient. Occasionally, new anastomoses will form to provide alternate routes of blood flow, known as collateral circulation, to the myocardium. Collaterals help protect muscle cells from damage that could result from blocked vessels.
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What is a possible cause of stenosis of the bicuspid valve?
A. Endocarditis B. Pericarditis C. Cardiomyopathy D. Rheumatic fever E. Angina pectoris
What is the purpose of the secretions of the serosa?
A. Allow abdominal organs to slide against each other B. Reduce acidity C. Digest carbohydrates D. All of the choices are correct.
Which of the following statements concerning regulation of blood flow is TRUE?
A. In the systemic circuit, increased levels of metabolic waste products and decreased oxygen concentration in tissues promote hyperemia through the tissues. B. If blood flow to a tissue is blocked for a period of time and then the block is removed, the result is a reactive hyperemia in which blood flow through the affected tissue remains low. C. According to flow autoregulation, if blood pressure to an arteriole is decreased, blood flow will not return toward its original level until the original blood pressure is restored. D. In the systemic circuit, high levels of CO2 and metabolites tend to cause contraction in the smooth muscle of arteriole walls. E. The resistance to blood flow in brain and heart vascular beds does not vary in response to changes in local gas or metabolite concentrations.
The pectoralis major and minor and subclavius muscles are part of the lateral thoracic region group of muscles.
Answer the following statement true (T) or false (F)