Negative feedback loops are ________.
A. not homeostatic mechanisms
B. homeostatic mechanisms
C. associated with "vicious circles"
D. self-amplifying cycles
E. usually harmful
Answer: B
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a. weight loss c. nasal discharge b. diarrhea d. all of the above
What structure is formed by the thickening of the smooth muscle cell wall surrounding the bladder 2) that regulates the flow of urine from the bladder?
A) internal urethral sphincter B) detrusor muscle C) urethral muscle D) external urethral sphincter E) bladder sphincter
The blood-brain barrier is effective against the passage of ________
A) water B) nutrients such as glucose C) respiratory gases D) fats E) metabolic waste such as urea
Arterial systolic pressure occurs ____________________ while arterial diastolic pressure occurs_____________________
A. at the same time as closure of the semilunar valves; at the same time as closure of the atrioventricular valves B. during the isovolumetric contraction phase of the cardiac cycle; during the isovolumetric relaxation phase of the cardiac cycle C. at the same time as the P-wave of the electrocardiogram; at the same time as the T-wave of the electrocardiogram D. when the the ventricle reaches end-systolic volume; when the ventricle reaches end-diastolic volume E. during the middle of the phase of ventricular ejection; just before the semilunar valve opens