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 begins protein digestion in the stomach?

  1. AAmylase
  2. BLactase
  3. CLipase
  4. DPepsin
2.Easy

Which cells secrete antibodies?

  1. ANeutrophils
  2. BMacrophages
  3. CPlasma cells
  4. DHelper T cells
3.Easy

Which neurotransmitter is released at the neuromuscular junction of skeletal muscle?

  1. AAcetylcholine
  2. BNoradrenaline
  3. CDopamine
  4. DSerotonin
4.Medium

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

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

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

  1. AHalves
  2. BIncreases 4-fold
  3. CDoubles
  4. DIncreases about 16-fold
6.Medium

What is the main function of pulmonary surfactant?

  1. ATo carry oxygen across the alveolar wall
  2. BTo trap dust in the bronchi
  3. CTo reduce surface tension in the alveoli
  4. DTo kill bacteria in the airways
7.Hard

According to the length–tension relationship, why does a skeletal muscle fibre produce less force when overstretched?

  1. ACalcium is no longer released from the sarcoplasmic reticulum when stretched
  2. BThe muscle runs out of ATP when stretched
  3. CThe neuromuscular junction stops working
  4. DActin and myosin overlap less, so fewer cross-bridges form
8.Hard

In primary adrenal insufficiency (Addison's disease), which combination is expected?

  1. ALow sodium, low potassium and low ACTH
  2. BHigh sodium, low potassium and low ACTH
  3. CLow sodium, high potassium and high ACTH
  4. DHigh sodium, high potassium and high ACTH

Answer key

  1. 1. D · Pepsin
  2. 2. C · Plasma cells
  3. 3. A · Acetylcholine
  4. 4. A · Binding of one oxygen makes the next bind more easily
  5. 5. D · Increases about 16-fold
  6. 6. C · To reduce surface tension in the alveoli
  7. 7. D · Actin and myosin overlap less, so fewer cross-bridges form
  8. 8. C · Low sodium, high potassium and high ACTH

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