Physiology Exam 1: Mastering Ch. 1 – Flashcards
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Which of the following is the most accurate definition of homeostasis?
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the ability of an organism to maintain relatively constant internal conditions despite variability in external conditions
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Which is the best example of the law of mass balance?
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Eating a salty meal causes the kidney to secrete sodium.
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Which of the following best describes the concept of negative feedback as it relates to homeostasis?
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A negative feedback response demonstrates a fluctuation around a setpoint.
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A mother nurses her newborn boy with breast milk because he needs nutrients. This is an example of a ________ to explain why a mother nurses.
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teleological approach
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Which of the following is a buffer zone between the outside world and most of the cells of the body?
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extracellular fluid
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The following is a list of several levels of organization that make up the human body.
1. tissue
2. cell
3. organ
4. molecule
5. organism
6. organ system
The correct order from the smallest to the largest is
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molecule, cell, tissue, organ, organ system, organism
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"Glucose is transported from blood into cells by transporters in response to insulin." This type of explanation is
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mechanistic
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Which is NOT a key concept or theme in physiology?
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flow charts and graphs
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"Glucose is transported from blood into cells because cells require glucose to meet their energy needs." This type of explanation is
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teleological.
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Which is the following is an example of compartmentation at the intracellular level?
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Skeletal muscle cells have organelles called sarcoplasmic reticulum (SR) that contain large stores of calcium ions. The calcium is released during muscle contraction and then pumped back into the SR as the muscle relaxes.
