Human physiology worksheet with answers

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

1. AInsulin
2. BGlucagon
3. CGastrin
4. DSecretin

Which hormone, made mainly by the kidneys, stimulates red blood cell production?

1. AThrombopoietin
2. BRenin
3. CErythropoietin
4. DAldosterone

Which blood vessels have valves that prevent blood flowing backwards?

1. AArteries
2. BArterioles
3. CCapillaries
4. DVeins

Why do myelinated axons conduct action potentials faster than unmyelinated ones?

1. AMyelin releases neurotransmitter along the axon
2. BMyelin contains more sodium channels
3. CMyelin makes the axon thinner
4. DThe impulse jumps between nodes of Ranvier

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

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

Which ABO blood group has both anti-A and anti-B antibodies in the plasma?

1. AGroup AB
2. BGroup O
3. CGroup A
4. DGroup B

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. CHigh sodium, high potassium and high ACTH
4. DLow sodium, high potassium and high ACTH

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