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M.Sc Nursing Physiology — practice by topic

Browse 148 questions across 7 Physiology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Physiology topics

The Reproductive System (44)Fluid, Electrolyte, and Acid-Base Balance (40)Development and Inheritance (36)Anatomy and Physiology (28)Muscle Physiology (28)Physiology (28)Sports Science (28)

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In a newborn infant, water makes up approximately what percentage of body mass, according to OpenStax Anatomy and Physiology?Read the answer and worked solution →Which body organ has the lowest percentage of water content?Read the answer and worked solution →Of all the water in the human body, approximately what fraction is intracellular fluid (ICF)?Read the answer and worked solution →What fraction of total body water does the extracellular fluid (ECF) compartment account for?Read the answer and worked solution →

Worked practice questions

In a newborn infant, water makes up approximately what percentage of body mass, according to OpenStax Anatomy and Physiology?

  1. 75 percent
  2. 45 percent
  3. 50-60 percent
  4. 85 percent
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Correct answer: A. 75 percent

1. Body water content changes across the lifespan as the proportion of muscle, fat and bone changes. 2. Infants have the highest body water fraction of any age group. 3. Infant body water is about 75 percent of body mass, falling to 50-60 percent in adults and as low as 45 percent in old age. 4. So 75 percent is the correct figure for infants. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 26 "Fluid, Electrolyte, and Acid-Base Balance", p.1248 §Body Water Content_

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Which body organ has the lowest percentage of water content?

  1. Brain
  2. Teeth
  3. Kidneys
  4. Skin
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Correct answer: B. Teeth

1. Water content varies widely by organ and tissue type. 2. The brain and kidneys have the highest water content, at 80-85 percent of their mass. 3. Teeth are mineralised, dense structures with very little free water. 4. Teeth at only 8-10 percent water, the lowest of any tissue listed. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 26 "Fluid, Electrolyte, and Acid-Base Balance", p.1248 §Body Water Content_

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Of all the water in the human body, approximately what fraction is intracellular fluid (ICF)?

  1. 20 percent
  2. 33 percent
  3. 60 percent
  4. 80 percent
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Correct answer: C. 60 percent

1. Total body water is divided between the intracellular fluid (ICF) and extracellular fluid (ECF) compartments. 2. The ICF is the larger of the two compartments. 3. The ICF as about 60 percent of total body water, roughly 25 litres in an average adult male. 4. 33 percent is closer to the ECF share, and 20/80 percent do not match either compartment, so they are ruled out. 5. Therefore 60 percent is correct. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 26 "Fluid, Electrolyte, and Acid-Base Balance", p.1250 §Intracellular Fluid_

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