Human physiology worksheet with answers

Free printable Human physiology worksheet: 8 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy

Which mineral is an essential part of haemoglobin?

  1. ACalcium
  2. BIodine
  3. CIron
  4. DZinc
2.Easy

Which vitamin is needed by the liver to make several clotting factors?

  1. AVitamin C
  2. BVitamin K
  3. CVitamin B12
  4. DVitamin D
3.Easy

Which hormone, released by the stomach lining, stimulates gastric acid secretion?

  1. AInsulin
  2. BGastrin
  3. CSecretin
  4. DGlucagon
4.Medium

Why is the oxygen–haemoglobin dissociation curve S-shaped?

  1. AOxygen dissolves better in plasma at high partial pressure
  2. BRed cells change size as they take up oxygen
  3. CBinding of one oxygen makes the next bind more easily
  4. DHaemoglobin can bind only one oxygen molecule
5.Medium

During contraction of a skeletal muscle sarcomere, which band stays the same length?

  1. AThe whole sarcomere
  2. BA band
  3. CH zone
  4. DI band
6.Medium

Why can cardiac muscle not be tetanised like skeletal muscle?

  1. AIt is controlled only by hormones
  2. BIt is not striated
  3. CIt has no calcium in the sarcoplasmic reticulum
  4. DIts long refractory period lasts almost as long as the contraction
7.Hard

A patient hyperventilating during a panic attack has tingling fingers. What would the arterial blood gas most likely show?

  1. ALow pH and high PaCO₂
  2. BHigh pH and low PaCO₂
  3. CHigh pH and high bicarbonate
  4. DLow pH and low bicarbonate
8.Hard

In Otto Loewi's classic experiment, fluid from a vagus-stimulated frog heart slowed a second heart. What did this show?

  1. AThe heart beats without any nerve supply
  2. BNerve impulses spread through the fluid directly as electricity
  3. CThe vagus nerve speeds up the heart
  4. DNerves pass signals to their targets by releasing a chemical

Answer key

  1. 1. C · Iron
  2. 2. B · Vitamin K
  3. 3. B · Gastrin
  4. 4. C · Binding of one oxygen makes the next bind more easily
  5. 5. B · A band
  6. 6. D · Its long refractory period lasts almost as long as the contraction
  7. 7. B · High pH and low PaCO₂
  8. 8. D · Nerves pass signals to their targets by releasing a chemical

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