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 ion triggers contraction by binding to troponin in skeletal muscle?

  1. ASodium
  2. BChloride
  3. CCalcium
  4. DPotassium
2.Easy

What is stroke volume?

  1. AThe volume of blood in a ventricle at the end of filling
  2. BThe volume of blood ejected by a ventricle in one beat
  3. CThe volume of blood pumped by the heart per minute
  4. DThe volume of blood left in a ventricle after contraction
3.Easy

Which part of the nervous system is responsible for the "fight or flight" response?

  1. AParasympathetic nervous system
  2. BSympathetic nervous system
  3. CSomatic nervous system
  4. DEnteric nervous system
4.Medium

What is anatomical dead space?

  1. AThe air that stays in the lungs after full exhalation (residual volume)
  2. BThe space between the two pleural layers
  3. CAlveoli that have collapsed completely
  4. DThe volume of the conducting airways where no gas exchange happens
5.Medium

How is the ejection fraction calculated?

  1. ACardiac output ÷ heart rate
  2. BEnd-diastolic volume ÷ end-systolic volume
  3. CEnd-systolic volume ÷ stroke volume
  4. DStroke volume ÷ end-diastolic volume
6.Medium

Why can cardiac muscle not be tetanised like skeletal muscle?

  1. AIt is not striated
  2. BIts long refractory period lasts almost as long as the contraction
  3. CIt has no calcium in the sarcoplasmic reticulum
  4. DIt is controlled only by hormones
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. ASyndrome of inappropriate ADH secretion
  2. BCranial diabetes insipidus
  3. CAddison's disease with high aldosterone
  4. DPrimary hyperaldosteronism
8.Hard

After a head injury, a patient passes large volumes of very dilute urine and plasma sodium rises. What is the most likely cause?

  1. AExcess aldosterone
  2. BUncontrolled diabetes mellitus
  3. CLack of ADH release (cranial diabetes insipidus)
  4. DExcess ADH release (SIADH)

Answer key

  1. 1. C · Calcium
  2. 2. B · The volume of blood ejected by a ventricle in one beat
  3. 3. B · Sympathetic nervous system
  4. 4. D · The volume of the conducting airways where no gas exchange happens
  5. 5. D · Stroke volume ÷ end-diastolic volume
  6. 6. B · Its long refractory period lasts almost as long as the contraction
  7. 7. A · Syndrome of inappropriate ADH secretion
  8. 8. C · Lack of ADH release (cranial diabetes insipidus)

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