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

Which blood vessels have valves that prevent blood flowing backwards?

  1. AArteries
  2. BVeins
  3. CCapillaries
  4. DArterioles
2.Easy

Which structure of the inner ear converts sound vibrations into nerve signals?

  1. ASemicircular canals
  2. BTympanic membrane
  3. CAuditory tube
  4. DCochlea
3.Easy

The systolic blood pressure is the pressure in the arteries:

  1. AWhen the ventricles relax
  2. BWhen the atria contract
  3. CWhen the ventricles contract
  4. DBetween two heartbeats, during diastole
4.Medium

Which is a classic example of positive feedback in the body?

  1. AOxytocin release during labour
  2. BInsulin release after a meal
  3. CADH release when plasma osmolality rises
  4. DSweating when body temperature rises
5.Medium

Which receptors respond mainly to a fall in arterial oxygen levels?

  1. AStretch receptors in the lungs
  2. BCentral chemoreceptors in the medulla
  3. CBaroreceptors in the carotid sinus
  4. DPeripheral chemoreceptors in the carotid and aortic bodies
6.Medium

What is the main function of pulmonary surfactant?

  1. ATo carry oxygen across the alveolar wall
  2. BTo reduce surface tension in the alveoli
  3. CTo kill bacteria in the airways
  4. DTo trap dust in the bronchi
7.Hard

Hodgkin and Huxley's classic studies of the ionic basis of the action potential used which preparation?

  1. AThe frog sciatic nerve–muscle preparation
  2. BThe cat spinal cord
  3. CCultured human cortical neurons
  4. DThe squid giant axon
8.Hard

What is the main reason the ventricles do not contract at the same moment as the atria?

  1. AConduction is delayed at the atrioventricular node
  2. BThe ventricles have a longer refractory period only
  3. CThe Purkinje fibres conduct slowly
  4. DThe SA node fires twice per beat

Answer key

  1. 1. B · Veins
  2. 2. D · Cochlea
  3. 3. C · When the ventricles contract
  4. 4. A · Oxytocin release during labour
  5. 5. D · Peripheral chemoreceptors in the carotid and aortic bodies
  6. 6. B · To reduce surface tension in the alveoli
  7. 7. D · The squid giant axon
  8. 8. A · Conduction is delayed at the atrioventricular node

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