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

Exchange of gases and nutrients between blood and tissues happens mainly across the walls of:

  1. ACapillaries
  2. BVeins
  3. CArteries
  4. DArterioles
2.Easy

In which direction does oxygen move during gas exchange in the lungs?

  1. AFrom the blood into the alveoli
  2. BFrom the alveoli into the blood
  3. CFrom the pleura into the blood
  4. DFrom the blood into the bronchi
3.Easy

What is the functional unit of the kidney?

  1. ANephron
  2. BGlomerulus
  3. CRenal pyramid
  4. DCollecting duct
4.Medium

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

  1. AThe extracellular fluid
  2. BThe mitochondria
  3. CThe sarcoplasmic reticulum
  4. DThe nucleus
5.Medium

Which hormone increases water reabsorption in the collecting ducts of the kidney?

  1. AParathyroid hormone
  2. BAntidiuretic hormone (ADH)
  3. CAtrial natriuretic peptide
  4. DAldosterone
6.Medium

What causes the first heart sound (S1)?

  1. AClosure of the mitral and tricuspid valves
  2. BClosure of the aortic and pulmonary valves
  3. CBlood filling the atria
  4. DOpening of the aortic valve
7.Hard

A pulmonary embolus blocks blood flow to a well-ventilated region of lung. How does the ventilation–perfusion (V/Q) ratio of that region change?

  1. AIt becomes very high, acting as dead space
  2. BIt stays normal because ventilation falls too
  3. CIt becomes zero, acting as a shunt
  4. DIt becomes low, like in pneumonia
8.Hard

In Graves' disease, what thyroid function results are expected and why?

  1. ALow T4 and low TSH, because the hypothalamus fails
  2. BLow T4 and high TSH, because antibodies destroy the gland
  3. CHigh T4 and high TSH, because the anterior pituitary gland is overactive
  4. DHigh T4 and low TSH, because antibodies stimulate the TSH receptor

Answer key

  1. 1. A · Capillaries
  2. 2. B · From the alveoli into the blood
  3. 3. A · Nephron
  4. 4. C · The sarcoplasmic reticulum
  5. 5. B · Antidiuretic hormone (ADH)
  6. 6. A · Closure of the mitral and tricuspid valves
  7. 7. A · It becomes very high, acting as dead space
  8. 8. D · High T4 and low TSH, because antibodies stimulate the TSH receptor

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