Which of the following is consistent with homeostasis?
as body temperature rises, sweating occurs to cool the body
after drinking large amounts of water, urine output decreases to raise blood volume
decreases in blood pressure cause a corresponding decrease in heart rate
as blood pressure falls, blood flow to the heart decreases
The Correct Answer is A
A. As body temperature rises, sweating occurs to cool the body:
An example of negative feedback, where the body counters a change to restore normal state.
B. After drinking large amounts of water, urine output decreases to raise blood volume:
Urine output would actually increase to excrete the excess water and maintain volume.
C. Decreases in blood pressure cause a corresponding decrease in heart rate:
A decrease in blood pressure should cause the heart rate to increase (compensatory response).
D. As blood pressure falls, blood flow to the heart decreases:
The body usually increases heart rate and vasoconstriction to maintain cardiac output.
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Related Questions
Correct Answer is B
Explanation
A. an electron: An electron is a subatomic particle; it doesn’t retain the chemical properties of the element.
B. an atom: The atom is the smallest unit of an element that maintains its chemical identity and properties.
C. a chemical bond: A bond is the interaction between atoms, not a part of an element.
D. a proton: A proton is also a subatomic particle; it contributes to identity (atomic number) but isn’t an element by itself.
E. an orbital: An orbital is a region around the nucleus where electrons are likely to be found-it is not a unit of matter.
Correct Answer is E
Explanation
A. eicosanoids: Eicosanoids (like prostaglandins) are derived from arachidonic acid, not cholesterol.
B. fat soluble vitamins: These are vitamins A, D, E, and K, which are lipids but are not cholesterol-based structures.
C. phospholipids: Phospholipids have a glycerol backbone, fatty acids, and a phosphate group, not a steroid ring structure.
D. fats: Fats (triglycerides) are made of glycerol + three fatty acids, not cholesterol.
E. steroids: Steroids include cholesterol, testosterone, estrogen, and other hormones with a four-ring carbon backbone.
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