Coronary Ciculation & Exercise Cardiac Physiology

Which artery is commonly referred to as the "widow maker" due to its crucial role in supplying blood to the heart muscle, and its occlusion being often fatal?
Right coronary artery (RCA)
Left main coronary artery (LMCA)
Left circumflex artery (CX)
Posterior descending artery (PDA)
In approximately 90% of individuals, which artery supplies the posterior descending artery (PDA)?
Right coronary artery (RCA)
Left anterior descending artery (LAD)
Left circumflex artery (CX)
Left main coronary artery (LMCA)
Which artery supplies the anterior part of the interventricular septum and the anterior wall of the left ventricle?
Right coronary artery (RCA)
Left anterior descending artery (LAD)
Left circumflex artery (CX)
Posterior descending artery (PDA)
The right coronary artery (RCA) supplies which important structures in the heart?
Sinoatrial (SA) node and atrioventricular (AV) node
Left atrium and left ventricle
Right ventricle and pulmonary artery
Apex of the heart
In a right-dominant coronary system, which artery is responsible for supplying the inferior part of the left ventricle?
Left main coronary artery (LMCA)
Left circumflex artery (CX)
Left anterior descending artery (LAD)
Posterior descending artery (PDA)
During progressive exercise, which of the following is a typical response of diastolic blood pressure in healthy individuals?
Increases significantly
Decreases significantly
Remains the same or may decrease slightly
Rises along with systolic blood pressure
What compensatory mechanism helps to maintain cardiac output (CO) during sudden hypovolemia?
Increased stroke volume
Decreased heart rate
Increased heart rate and total peripheral resistance
Decreased total peripheral resistance
Which of the following is a recommended response if systolic blood pressure (SBP) exceeds 250 mmHg during exercise?
Continue exercise at the same intensity
Lower exercise intensity slightly
Stop the exercise test immediately
Increase exercise intensity to lower blood pressure
Which physiological change during exercise contributes most to an increase in cardiac output?
Increase in diastolic pressure
Increase in total peripheral resistance
Increase in stroke volume and heart rate
Decrease in venous return
How does the body maintain venous return during exercise?
By decreasing total peripheral resistance
Through vasodilation of peripheral vessels
By increasing venous return through sympathetic stimulation and muscle contractions
By decreasing heart rate
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