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

In which direction does oxygen move during gas exchange in the lungs?

  1. AFrom the blood into the bronchi
  2. BFrom the alveoli into the blood
  3. CFrom the pleura into the blood
  4. DFrom the blood into the alveoli
2.Easy

Which enzyme in saliva starts the digestion of starch?

  1. APepsin
  2. BSalivary amylase
  3. CTrypsin
  4. DLipase
3.Easy

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

  1. AGastrin
  2. BGlucagon
  3. CSecretin
  4. DInsulin
4.Medium

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

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

Why can cardiac muscle not be tetanised like skeletal muscle?

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

What is the main effect of vagus nerve stimulation on the heart?

  1. AIt increases the heart rate
  2. BIt slows the heart rate
  3. CIt increases ventricular contractility strongly
  4. DIt constricts the coronary arteries
7.Hard

A patient with small-cell lung cancer has low plasma sodium and low plasma osmolality but inappropriately concentrated urine. What is the most likely explanation?

  1. APrimary hyperaldosteronism
  2. BCranial diabetes insipidus
  3. CSyndrome of inappropriate ADH secretion
  4. DAddison's disease with high aldosterone
8.Hard

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

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

Answer key

  1. 1. B · From the alveoli into the blood
  2. 2. B · Salivary amylase
  3. 3. A · Gastrin
  4. 4. C · The impulse jumps between nodes of Ranvier
  5. 5. C · Its long refractory period lasts almost as long as the contraction
  6. 6. B · It slows the heart rate
  7. 7. C · Syndrome of inappropriate ADH secretion
  8. 8. A · Nerves pass signals to their targets by releasing a chemical

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