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 in saliva starts the digestion of starch?

  1. ASalivary amylase
  2. BPepsin
  3. CLipase
  4. DTrypsin
2.Easy

Which hormone raises blood calcium levels?

  1. AThyroxine
  2. BInsulin
  3. CCalcitonin
  4. DParathyroid hormone
3.Easy

Which cells secrete antibodies?

  1. APlasma cells
  2. BHelper T cells
  3. CNeutrophils
  4. DMacrophages
4.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. COxygen dissolves better in plasma at high partial pressure
  4. DRed cells change size as they take up oxygen
5.Medium

What is the main stimulus for breathing in a healthy person?

  1. AA fall in blood pH caused by lactate only
  2. BA fall in arterial O₂
  3. CA rise in blood glucose
  4. DA rise in arterial CO₂
6.Medium

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

  1. AIt increases ventricular contractility strongly
  2. BIt increases the heart rate
  3. CIt constricts the coronary arteries
  4. DIt slows the heart rate
7.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 heart beats without any nerve supply
  3. CThe vagus nerve speeds up the heart
  4. DNerve impulses spread through the fluid directly as electricity
8.Hard

A patient has taken high-dose prednisolone for a year. What is the state of the hypothalamic–pituitary–adrenal axis?

  1. AACTH is high and the adrenal cortex is enlarged
  2. BThe adrenal medulla has stopped making adrenaline and noradrenaline
  3. CACTH is normal and cortisol production is increased
  4. DACTH is suppressed and the adrenal cortex has atrophied

Answer key

  1. 1. A · Salivary amylase
  2. 2. D · Parathyroid hormone
  3. 3. A · Plasma cells
  4. 4. B · Binding of one oxygen makes the next bind more easily
  5. 5. D · A rise in arterial CO₂
  6. 6. D · It slows the heart rate
  7. 7. A · Nerves pass signals to their targets by releasing a chemical
  8. 8. D · ACTH is suppressed and the adrenal cortex has atrophied

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