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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Name: ____________________   Date: ____________

1.Easy

Most homeostatic control systems in the body work by:

  1. ANegative feedback
  2. BRandom variation
  3. CPositive feedback
  4. DFeed-forward only
2.Easy

The systolic blood pressure is the pressure in the arteries:

  1. ABetween two heartbeats, during diastole
  2. BWhen the ventricles relax
  3. CWhen the ventricles contract
  4. DWhen the atria contract
3.Easy

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

  1. AGastrin
  2. BSecretin
  3. CInsulin
  4. DGlucagon
4.Medium

According to Poiseuille's law, if the radius of an arteriole halves, its resistance to flow:

  1. ADoubles
  2. BIncreases 4-fold
  3. CIncreases about 16-fold
  4. DHalves
5.Medium

Vital capacity is the sum of which lung volumes?

  1. ATidal volume and residual volume
  2. BInspiratory reserve volume and residual volume
  3. CResidual volume and expiratory reserve volume
  4. DTidal volume, inspiratory reserve volume and expiratory reserve volume
6.Medium

In which form is most carbon dioxide carried in the blood?

  1. AAs carbonic acid in platelets
  2. BAs bicarbonate ions in plasma
  3. CBound to the haem iron
  4. DDissolved as CO₂ gas
7.Hard

Which adaptation develops over days to weeks at high altitude?

  1. AIncreased renal bicarbonate retention
  2. BHigher erythropoietin levels and more red blood cells
  3. CA fall in haematocrit
  4. DLower ventilation to save oxygen
8.Hard

Which transporter in the thick ascending limb of the loop of Henle is key to building the medullary concentration gradient?

  1. AThe epithelial sodium channel (ENaC)
  2. BThe sodium–glucose cotransporter (SGLT2)
  3. CThe Na⁺–K⁺–2Cl⁻ cotransporter (NKCC2)
  4. DAquaporin-2 water channels

Answer key

  1. 1. A · Negative feedback
  2. 2. C · When the ventricles contract
  3. 3. A · Gastrin
  4. 4. C · Increases about 16-fold
  5. 5. D · Tidal volume, inspiratory reserve volume and expiratory reserve volume
  6. 6. B · As bicarbonate ions in plasma
  7. 7. B · Higher erythropoietin levels and more red blood cells
  8. 8. C · The Na⁺–K⁺–2Cl⁻ cotransporter (NKCC2)

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