Human physiology worksheet with answers

Which enzyme begins protein digestion in the stomach?

1. AAmylase
2. BPepsin
3. CLactase
4. DLipase

Which part of the brain regulates body temperature, hunger and thirst?

1. AOccipital lobe
2. BCerebellum
3. CMedulla oblongata
4. DHypothalamus

Where is most of the nutrient absorption in the digestive tract?

1. AOesophagus
2. BLarge intestine
3. CStomach
4. DSmall intestine

What is the main effect of aldosterone on the kidney?

1. AWater reabsorption by inserting aquaporins only
2. BGlucose reabsorption in the proximal tubule
3. CIncreased filtration in the glomerulus
4. DSodium reabsorption and potassium secretion in the distal nephron

Which ion enters the cell to cause the depolarisation phase of a typical neuronal action potential?

1. AChloride (Cl⁻)
2. BCalcium (Ca²⁺)
3. CSodium (Na⁺)
4. DPotassium (K⁺)

Since action potentials are all-or-none, how does a neuron signal a stronger stimulus?

1. ABy changing the neurotransmitter it releases
2. BBy firing action potentials more often
3. CBy making each action potential longer
4. DBy making each action potential larger

Why does a deep sea diver risk decompression sickness when surfacing quickly?

1. AOxygen becomes toxic at the surface
2. BThe lungs collapse when the pressure falls
3. CNitrogen dissolved at high pressure forms bubbles as the pressure falls
4. DCarbon dioxide cannot leave the lungs fast enough

A young woman has muscle weakness that gets worse with repeated use and improves with an acetylcholinesterase inhibitor. What is the most likely mechanism?

1. AAntibodies against acetylcholine receptors at the neuromuscular junction
2. BDemyelination of central nervous system tracts
3. CLoss of motor neurons in the spinal cord
4. DA defect in the dystrophin protein of muscle