Human physiology worksheet with answers

Which enzyme in saliva starts the digestion of starch?

1. ALipase
2. BSalivary amylase
3. CPepsin
4. DTrypsin

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

1. AMedulla oblongata
2. BCerebellum
3. CHypothalamus
4. DOccipital lobe

What is stroke volume?

1. AThe volume of blood in a ventricle at the end of filling
2. BThe volume of blood ejected by a ventricle in one beat
3. CThe volume of blood left in a ventricle after contraction
4. DThe volume of blood pumped by the heart per minute

In which form is most carbon dioxide carried in the blood?

1. ADissolved as CO₂ gas
2. BAs bicarbonate ions in plasma
3. CAs carbonic acid in platelets
4. DBound to the haem iron

Why can cardiac muscle not be tetanised like skeletal muscle?

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

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

Which transporter in the thick ascending limb of the loop of Henle is key to building the medullary concentration gradient?

1. AAquaporin-2 water channels
2. BThe epithelial sodium channel (ENaC)
3. CThe sodium–glucose cotransporter (SGLT2)
4. DThe Na⁺–K⁺–2Cl⁻ cotransporter (NKCC2)

A patient hyperventilating during a panic attack has tingling fingers. What would the arterial blood gas most likely show?

1. AHigh pH and low PaCO₂
2. BLow pH and low bicarbonate
3. CLow pH and high PaCO₂
4. DHigh pH and high bicarbonate