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 hormone, released by the stomach lining, stimulates gastric acid secretion?

  1. AGlucagon
  2. BGastrin
  3. CInsulin
  4. DSecretin
2.Easy

Which hormone is mainly produced by the testes?

  1. AProgesterone
  2. BProlactin
  3. COxytocin
  4. DTestosterone
3.Easy

What is tidal volume?

  1. AThe maximum volume of air that can be breathed out after a full breath in
  2. BThe volume of air moved in or out in one normal breath
  3. CThe air left in the lungs after a full exhalation
  4. DThe total volume of air in the lungs
4.Medium

What causes the first heart sound (S1)?

  1. AClosure of the mitral and tricuspid valves
  2. BBlood filling the atria
  3. COpening of the aortic valve
  4. DClosure of the aortic and pulmonary valves
5.Medium

Why is the oxygen–haemoglobin dissociation curve S-shaped?

  1. ARed cells change size as they take up oxygen
  2. BBinding of one oxygen makes the next bind more easily
  3. COxygen dissolves better in plasma at high partial pressure
  4. DHaemoglobin can bind only one oxygen molecule
6.Medium

In skeletal muscle, where does most of the calcium for contraction come from?

  1. AThe mitochondria
  2. BThe extracellular fluid
  3. CThe nucleus
  4. DThe sarcoplasmic reticulum
7.Hard

Which substance's clearance is used as the gold standard to measure glomerular filtration rate?

  1. AUrea
  2. BCreatinine
  3. CGlucose
  4. DInulin
8.Hard

During exercise, blood flow to active skeletal muscle rises greatly. What is the main cause?

  1. ALocal metabolites such as CO₂, H⁺, K⁺ and adenosine dilate the arterioles
  2. BThe parasympathetic system dilates all arteries
  3. CThe heart pumps blood only to the muscles
  4. DSympathetic stimulation constricts the muscle arterioles via alpha receptors

Answer key

  1. 1. B · Gastrin
  2. 2. D · Testosterone
  3. 3. B · The volume of air moved in or out in one normal breath
  4. 4. A · Closure of the mitral and tricuspid valves
  5. 5. B · Binding of one oxygen makes the next bind more easily
  6. 6. D · The sarcoplasmic reticulum
  7. 7. D · Inulin
  8. 8. A · Local metabolites such as CO₂, H⁺, K⁺ and adenosine dilate the arterioles

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