Human physiology worksheet with answers

Which hormone is mainly produced by the testes?

1. AProgesterone
2. BOxytocin
3. CProlactin
4. DTestosterone

Which gland is often called the "master gland" because it controls many other endocrine glands?

1. APineal gland
2. BPituitary gland
3. CThyroid gland
4. DAdrenal gland

Which structure of the inner ear converts sound vibrations into nerve signals?

1. ATympanic membrane
2. BAuditory tube
3. CSemicircular canals
4. DCochlea

The hormone secretin is released when acid enters the duodenum. What is its main effect?

1. AInsulin release from the endocrine pancreas
2. BContraction of the gallbladder
3. CBicarbonate secretion from the pancreas
4. DAcid secretion from the stomach

Besides lowering glucose, insulin moves which ion into cells, an effect used to treat hyperkalaemia?

1. ASodium
2. BPotassium
3. CChloride
4. DCalcium

How does glucagon raise blood glucose?

1. AIt slows glucose absorption from the gut
2. BIt blocks insulin receptors on fat cells
3. CIt stimulates glycogen breakdown and gluconeogenesis in the liver
4. DIt stimulates glucose uptake by muscle

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

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

In the renin–angiotensin–aldosterone system, where is angiotensin I mainly converted to angiotensin II?

1. AIn the liver
2. BIn the kidneys' juxtaglomerular cells
3. CIn the lungs
4. DIn the adrenal cortex