The risk of developing coronary artery disease is increased up to threefold by

A pulmonary embolism (PE) occurs when a blood clot, typically originating from the deep veins of the legs or pelvis, travels through the bloodstream and lodges in one of the pulmonary arteries in the lungs.

Deep venous thrombosis (DVT) is the most common source of pulmonary emboli. DVT occurs when a blood clot forms in the deep veins of the legs, pelvis, or arms, and can develop due to prolonged immobility, surgery, trauma, cancer, pregnancy, hormone therapy, or genetic factors.

Endocarditis, valvular heart disease, and left heart failure are not typical sources of pulmonary emboli. Endocarditis is an infection of the heart valves and lining, which can lead to valve damage and heart failure, but does not usually cause blood clots. Valvular heart disease, which includes conditions such as aortic stenosis and mitral regurgitation, can cause blood flow disturbances and increase the risk of thrombosis, but does not directly cause blood clots. Left heart failure, which occurs when the left ventricle of the heart is unable to pump effectively, can cause fluid buildup in the lungs, but does not typically cause blood clots to form.

The correct answer is B. Systolic pressure less than 120 mmHg and diastolic pressure less than 80 mmHg is considered normal blood pressure in adults according to current guidelines. A systolic pressure between 140-150 mmHg (option A) would be classified as stage 1 hypertension, while a systolic pressure greater than 140 mmHg and diastolic pressure of 100 mmHg (option D) would be classified as stage 2 hypertension. A systolic pressure less than 100 mmHg regardless of diastolic pressure (option C) would be considered low blood pressure.