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 enzyme begins protein digestion in the stomach?

  1. ALactase
  2. BAmylase
  3. CPepsin
  4. DLipase
2.Easy

What is the typical resting membrane potential of a neuron?

  1. AAbout −70 mV
  2. BAbout 0 mV
  3. CAbout −10 mV
  4. DAbout +70 mV
3.Easy

What is tidal volume?

  1. AThe maximum volume of air that can be breathed out after a full breath in
  2. BThe air left in the lungs after a full exhalation
  3. CThe volume of air moved in or out in one normal breath
  4. DThe total volume of air in the lungs
4.Medium

Why can cardiac muscle not be tetanised like skeletal muscle?

  1. AIt has no calcium in the sarcoplasmic reticulum
  2. BIts long refractory period lasts almost as long as the contraction
  3. CIt is not striated
  4. DIt is controlled only by hormones
5.Medium

What is the normal pH range of arterial blood?

  1. A6.80 to 7.00
  2. B7.35 to 7.45
  3. C7.00 to 7.20
  4. D7.50 to 7.65
6.Medium

Low plasma albumin, as in severe liver disease, causes oedema mainly because:

  1. ACapillary hydrostatic pressure falls
  2. BPlasma oncotic pressure falls
  3. CLymphatic drainage increases
  4. DThe capillaries become impermeable
7.Hard

Why can a patient with carbon monoxide poisoning have a normal PaO₂ but severe tissue hypoxia?

  1. ACO blocks diffusion across the alveolar wall
  2. BCO stops oxygen from dissolving in plasma
  3. CCO occupies haemoglobin binding sites, so oxygen content falls
  4. DCO lowers the barometric pressure in the alveoli
8.Hard

A patient's arterial blood gas shows pH 7.30, PaCO₂ 7.8 kPa (59 mmHg) and normal bicarbonate. What is the most likely disturbance?

  1. AMetabolic acidosis
  2. BCompensated metabolic alkalosis
  3. CAcute respiratory acidosis
  4. DRespiratory alkalosis

Answer key

  1. 1. C · Pepsin
  2. 2. A · About −70 mV
  3. 3. C · The volume of air moved in or out in one normal breath
  4. 4. B · Its long refractory period lasts almost as long as the contraction
  5. 5. B · 7.35 to 7.45
  6. 6. B · Plasma oncotic pressure falls
  7. 7. C · CO occupies haemoglobin binding sites, so oxygen content falls
  8. 8. C · Acute respiratory acidosis

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