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 type of white blood cell is the most numerous in healthy adult blood?

  1. AEosinophils
  2. BMonocytes
  3. CNeutrophils
  4. DLymphocytes
2.Easy

What is the main function of platelets?

  1. AFighting infection
  2. BCarrying carbon dioxide
  3. CProducing antibodies
  4. DBlood clotting
3.Easy

Which hormone, released by the pineal gland in darkness, helps regulate the sleep–wake cycle?

  1. ACortisol
  2. BMelatonin
  3. COxytocin
  4. DAdrenaline
4.Medium

Which receptor is stimulated when the patellar tendon is tapped in the knee-jerk reflex?

  1. ANociceptor
  2. BGolgi tendon organ
  3. CMuscle spindle
  4. DPacinian corpuscle
5.Medium

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

  1. AHaemoglobin can bind only one oxygen molecule
  2. BBinding of one oxygen makes the next bind more easily
  3. CRed cells change size as they take up oxygen
  4. DOxygen dissolves better in plasma at high partial pressure
6.Medium

Since action potentials are all-or-none, how does a neuron signal a stronger stimulus?

  1. ABy firing action potentials more often
  2. BBy changing the neurotransmitter it releases
  3. CBy making each action potential larger
  4. DBy making each action potential longer
7.Hard

Spirometry shows reduced FEV1 and reduced FVC, with a normal or high FEV1/FVC ratio. What pattern is this?

  1. AA restrictive pattern, as in pulmonary fibrosis
  2. BA normal result in an older adult
  3. CAn obstructive pattern, as in asthma
  4. DAn obstructive pattern, as in emphysema or chronic bronchitis
8.Hard

Why does a person with lactase deficiency get diarrhoea and bloating after drinking milk?

  1. ALactose is absorbed too quickly and raises blood glucose
  2. BMilk protein triggers an allergic reaction
  3. CUndigested lactose draws water into the gut and is fermented by colonic bacteria
  4. DLactose damages the villi directly

Answer key

  1. 1. C · Neutrophils
  2. 2. D · Blood clotting
  3. 3. B · Melatonin
  4. 4. C · Muscle spindle
  5. 5. B · Binding of one oxygen makes the next bind more easily
  6. 6. A · By firing action potentials more often
  7. 7. A · A restrictive pattern, as in pulmonary fibrosis
  8. 8. C · Undigested lactose draws water into the gut and is fermented by colonic bacteria

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