Human physiology worksheet with answers

Which type of white blood cell is the most numerous in healthy adult blood?

1. AMonocytes
2. BEosinophils
3. CLymphocytes
4. DNeutrophils

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

1. ADopamine
2. BNoradrenaline
3. CSerotonin
4. DAcetylcholine

Which hormone is mainly produced by the testes?

1. AOxytocin
2. BProgesterone
3. CTestosterone
4. DProlactin

Why can cardiac muscle not be tetanised like skeletal muscle?

1. AIt is controlled only by hormones
2. BIt is not striated
3. CIts long refractory period lasts almost as long as the contraction
4. DIt has no calcium in the sarcoplasmic reticulum

Which hormonal event triggers ovulation?

1. AA fall in oestrogen
2. BA surge of luteinising hormone (LH)
3. CA surge of prolactin
4. DA rise in progesterone from the corpus luteum

Which receptors respond mainly to a fall in arterial oxygen levels?

1. APeripheral chemoreceptors in the carotid and aortic bodies
2. BCentral chemoreceptors in the medulla
3. CBaroreceptors in the carotid sinus
4. DStretch receptors in the lungs

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 becomes zero, acting as a shunt
3. CIt becomes low, like in pneumonia
4. DIt stays normal because ventilation falls too

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. ACranial diabetes insipidus
2. BSyndrome of inappropriate ADH secretion
3. CAddison's disease with high aldosterone
4. DPrimary hyperaldosteronism