Positive feedback mechanisms:
Usually produce stable conditions.
Cause long-term changes.
Move conditions away from the normal state.
Bring conditions back to the normal state.
The Correct Answer is C
Positive feedback mechanisms move conditions away from the normal state.
They amplify the original action and produce more of the same effect.
For example, blood clotting and childbirth are positive feedback mechanisms.
Choice A is wrong because positive feedback mechanisms usually produce unstable conditions.
They do not resist change but rather enhance it.
Choice B is wrong because positive feedback mechanisms do not cause long-term changes.
They are ultimately stopped by negative feedback loops once the process they were used for is complete.
Choice D is wrong because positive feedback mechanisms do not bring conditions back to the normal state.
That is the role of negative feedback mechanisms, which oppose the stimulus and restore homeostasis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
The fibrous pericardium is the loose-fitting sac around the heart that protects it and anchors it to surrounding structures.
Choice B is wrong because the epicardium is the outer layer of the heart wall, also called the visceral pericardium, and it is not a sac.
Choice C is wrong because the endocardium is the inner layer of the heart wall that forms the lining of all heart chambers, and it is not a sac.
Choice D is wrong because the visceral pericardium is another name for the epicardium, and it is not a loose-fitting sac.
Correct Answer is B
Explanation
The aorta is the largest artery in the human body, as well as the main artery in the circulatory system.
It originates from the left ventricle of the heart and extends down to the abdomen, where it splits into two smaller arteries (the common iliac arteries).
The aorta distributes oxygenated blood to all parts of the body through the systemic circulation.
Choice A. Carotid is wrong because the carotid artery is not the largest artery in the body, but one of the main arteries that pumps blood from the heart to the brain and the rest of the head.
It has a diameter of 4.3 mm-7.7 mm and a blood flow of 350-550 milliliters per minute.
Choice C. Celiac is wrong because the celiac artery is not the largest artery in the body, but a major branch of the abdominal aorta that supplies oxygenated blood to the liver, stomach, spleen, pancreas, and duodenum.
Choice D. Femoral is wrong because the femoral artery is not the largest artery in the body, but the largest artery found in the leg region.
It runs down the inner thigh and carries out the important role of supplying blood to the lower body.
It has a diameter of 6.6 mm and a blood flow of 284 milliliters per minute.
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