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Positive feedback differs from negative feedback because __________ .


A) positive feedback provides moment-to-moment wellbeing while negative feedback causes a cascade effect
B) positive feedback tends to enhance the triggering stimulus while negative feedback tends to return the body to a homeostatic balance or "ideal" level
C) positive feedback is critical to health while negative feedback serves only to alert us to potential health threats
D) positive feedback is generally beneficial while negative feedback is typically harmful

E) B) and C)
F) C) and D)

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A small family was traveling in its van and had a minor accident. The children in the back seats were wearing lap belts, but still sustained numerous bruises about the abdomen, and had some internal organ injuries. Why is this area more vulnerable to damage than others?

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The abdominal organs are the l...

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The dorsal body cavity is the site of which of the following?


A) lungs
B) intestines
C) liver
D) brain

E) A) and D)
F) None of the above

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Which one of the following systems responds fastest to environmental stimuli?


A) lymphatic
B) immune
C) nervous
D) muscular

E) A) and B)
F) C) and D)

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Some of the nerve endings in the skin are sensitive to changes in temperature. They are part of a negative feedback mechanism regulating body temperature. These nerve endings represent a(n) __________in the negative feedback mechanism.


A) control center
B) homeostatic balance or "ideal" value
C) receptor
D) effector

E) A) and D)
F) B) and C)

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What can happen when the usual negative feedback mechanisms are overwhelmed and destructive positive feedback mechanisms take over?

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Homeostatic imbalances increas...

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What is a dynamic equilibrium of your internal environment termed?

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What does the "principle of complementarity of structures and function" mean?

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Structure is specifi...

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What broad term covers all chemical reactions that occur within the body cells?

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The body cavities that protect the nervous system are located in the __________ cavity.


A) ventral
B) cranial
C) vertebral
D) dorsal
E) thoracic

F) None of the above
G) B) and E)

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