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 ion triggers contraction by binding to troponin in skeletal muscle?

  1. ASodium
  2. BPotassium
  3. CChloride
  4. DCalcium
2.Easy

What is the main function of platelets?

  1. ABlood clotting
  2. BFighting infection
  3. CCarrying carbon dioxide
  4. DProducing antibodies
3.Easy

Which mineral is an essential part of haemoglobin?

  1. AIron
  2. BIodine
  3. CCalcium
  4. DZinc
4.Medium

During which phase of the cardiac cycle are all four heart valves closed while ventricular pressure rises?

  1. ARapid filling
  2. BRapid ejection
  3. CAtrial systole
  4. DIsovolumetric contraction
5.Medium

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

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

Why do myelinated axons conduct action potentials faster than unmyelinated ones?

  1. AMyelin makes the axon thinner
  2. BMyelin contains more sodium channels
  3. CThe impulse jumps between nodes of Ranvier
  4. DMyelin releases neurotransmitter along the axon
7.Hard

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

  1. ANerve impulses spread through the fluid directly as electricity
  2. BThe vagus nerve speeds up the heart
  3. CNerves pass signals to their targets by releasing a chemical
  4. DThe heart beats without any nerve supply
8.Hard

Constriction of the efferent arteriole of a glomerulus, with the afferent arteriole unchanged, tends to:

  1. AHave no effect on GFR at all
  2. BStop filtration completely
  3. CRaise glomerular capillary pressure and GFR
  4. DLower glomerular capillary pressure and GFR

Answer key

  1. 1. D · Calcium
  2. 2. A · Blood clotting
  3. 3. A · Iron
  4. 4. D · Isovolumetric contraction
  5. 5. D · Binding of one oxygen makes the next bind more easily
  6. 6. C · The impulse jumps between nodes of Ranvier
  7. 7. C · Nerves pass signals to their targets by releasing a chemical
  8. 8. C · Raise glomerular capillary pressure and GFR

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