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 blood vessels have valves that prevent blood flowing backwards?

  1. AArteries
  2. BCapillaries
  3. CArterioles
  4. DVeins
2.Easy

Which cells secrete antibodies?

  1. AMacrophages
  2. BPlasma cells
  3. CHelper T cells
  4. DNeutrophils
3.Easy

Which enzyme begins protein digestion in the stomach?

  1. ALipase
  2. BAmylase
  3. CLactase
  4. DPepsin
4.Medium

The Frank–Starling mechanism describes that:

  1. AHeart rate rises when arterial blood pressure falls suddenly
  2. BContractility falls when temperature rises
  3. CStroke volume rises when ventricular filling increases
  4. DThe atria contract after the ventricles
5.Medium

Which receptor is stimulated when the patellar tendon is tapped in the knee-jerk reflex?

  1. AGolgi tendon organ
  2. BMuscle spindle
  3. CPacinian corpuscle
  4. DNociceptor
6.Medium

According to Poiseuille's law, if the radius of an arteriole halves, its resistance to flow:

  1. ADoubles
  2. BIncreases about 16-fold
  3. CHalves
  4. DIncreases 4-fold
7.Hard

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

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

Why does a person with a high spinal cord injury above T1 risk low blood pressure?

  1. ARenin release from the kidney stops completely
  2. BThe vagus nerve is cut, so the heart rate rises
  3. CThe phrenic nerve can no longer control the tone of the arteries
  4. DThe sympathetic outflow to the vessels and heart is cut off

Answer key

  1. 1. D · Veins
  2. 2. B · Plasma cells
  3. 3. D · Pepsin
  4. 4. C · Stroke volume rises when ventricular filling increases
  5. 5. B · Muscle spindle
  6. 6. B · Increases about 16-fold
  7. 7. C · Low pH, low bicarbonate and low PaCO₂
  8. 8. D · The sympathetic outflow to the vessels and heart is cut off

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