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

  1. AThyroid gland
  2. BAdrenal gland
  3. CPineal gland
  4. DPituitary gland
2.Easy

What is the main function of platelets?

  1. ACarrying carbon dioxide
  2. BFighting infection
  3. CProducing antibodies
  4. DBlood clotting
3.Easy

Which blood vessels have valves that prevent blood flowing backwards?

  1. AArteries
  2. BArterioles
  3. CCapillaries
  4. DVeins
4.Medium

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

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

Cardiac output equals heart rate multiplied by:

  1. AStroke volume
  2. BEjection fraction
  3. CPeripheral resistance
  4. DBlood pressure
6.Medium

Which hormone is released by the adrenal cortex in response to ACTH?

  1. AAldosterone, as the main response
  2. BAdrenaline
  3. CCortisol
  4. DThyroxine
7.Hard

A patient with diabetic ketoacidosis breathes deeply and rapidly. What pattern is expected on the blood gas?

  1. ALow pH, normal bicarbonate and high PaCO₂
  2. BLow pH, low bicarbonate and low PaCO₂
  3. CHigh pH, low bicarbonate and low PaCO₂
  4. DLow pH, high bicarbonate and high PaCO₂
8.Hard

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

  1. AThe heart beats without any nerve supply
  2. BNerve impulses spread through the fluid directly as electricity
  3. CThe vagus nerve speeds up the heart
  4. DNerves pass signals to their targets by releasing a chemical

Answer key

  1. 1. D · Pituitary gland
  2. 2. D · Blood clotting
  3. 3. D · Veins
  4. 4. A · A rise in arterial CO₂
  5. 5. A · Stroke volume
  6. 6. C · Cortisol
  7. 7. B · Low pH, low bicarbonate and low PaCO₂
  8. 8. D · Nerves pass signals to their targets by releasing a chemical

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