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

What is the liquid part of blood in which the cells are suspended called?

  1. ALymph
  2. BInterstitial fluid
  3. CCytoplasm
  4. DPlasma
2.Easy

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

  1. AMelatonin
  2. BOxytocin
  3. CCortisol
  4. DAdrenaline
3.Easy

Which gland is often called the "master gland" because it controls many other endocrine glands?

  1. APituitary gland
  2. BThyroid gland
  3. CPineal gland
  4. DAdrenal gland
4.Medium

The hormone secretin is released when acid enters the duodenum. What is its main effect?

  1. AInsulin release from the endocrine pancreas
  2. BAcid secretion from the stomach
  3. CBicarbonate secretion from the pancreas
  4. DContraction of the gallbladder
5.Medium

Where is the heart's natural pacemaker?

  1. AAtrioventricular node
  2. BBundle of His
  3. CSinoatrial node
  4. DPurkinje fibres
6.Medium

Where does the final activation step of vitamin D (1-alpha hydroxylation) take place?

  1. ASmall intestine
  2. BKidney
  3. CLiver
  4. DSkin
7.Hard

Which combination of signs is expected in a patient in early hypovolaemic shock after major bleeding?

  1. ATachycardia, warm flushed skin and high urine output
  2. BBradycardia, cool pale skin and high urine output
  3. CTachycardia, cool pale skin and reduced urine output
  4. DBradycardia, warm flushed skin and high urine output
8.Hard

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

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

Answer key

  1. 1. D · Plasma
  2. 2. A · Melatonin
  3. 3. A · Pituitary gland
  4. 4. C · Bicarbonate secretion from the pancreas
  5. 5. C · Sinoatrial node
  6. 6. B · Kidney
  7. 7. C · Tachycardia, cool pale skin and reduced urine output
  8. 8. D · CO occupies haemoglobin binding sites, so oxygen content falls

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