Human physiology worksheet with answers

Which organ makes most plasma proteins, such as albumin?

1. AKidney
2. BLiver
3. CSpleen
4. DBone marrow

Which organ filters the blood to produce urine?

1. ASpleen
2. BBladder
3. CKidney
4. DLiver

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

1. AStomach
2. BOesophagus
3. CSmall intestine
4. DLarge intestine

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

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

What does the QRS complex on an ECG represent?

1. AVentricular repolarisation
2. BAtrial depolarisation
3. CVentricular depolarisation
4. DAtrial repolarisation

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

1. AChloride (Cl⁻)
2. BPotassium (K⁺)
3. CSodium (Na⁺)
4. DCalcium (Ca²⁺)

At the start of a fever, a patient shivers and feels cold even though body temperature is rising. Why?

1. APyrogens raise the hypothalamic set point above the current body temperature
2. BSweating has already cooled the body too much
3. CThe thermoreceptors in the skin are destroyed
4. DThe body has lost its ability to produce heat

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

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