This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
The low pressure receptors are 
Select and explain. 
A. Affected by cardiac output, B. Stimulated by atrial systole and diastole, C. Stimuation by left ventricular contraction, D. Stimulated by aoic pressure
B: Stimulated by atrial systole and diastole
Answer: B: Stimulated by atrial systole and diastole 
Explanation: The low-pressure receptors are stimulated by atrial systole and diastole.. The low-pressure receptors are those in the great veins, right and left atria and pulmonary vessels. Atrial stretch receptors are of two types: Type A: discharge primarily during atrial systole . Type B: discharge primarily during late diastole. Distension of the atrial walls - stimulation of atrial receptors - vasodilatation, fall in BP and increased hea rate. Ref: Ganong review of Medical Physiology 26th edition Pgno: 577,578