Human physiology worksheet with answers

Which organ makes most plasma proteins, such as albumin?

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

Which enzyme begins protein digestion in the stomach?

1. ALactase
2. BPepsin
3. CAmylase
4. DLipase

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

1. ACochlea
2. BTympanic membrane
3. CAuditory tube
4. DSemicircular canals

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

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

Why is the oxygen–haemoglobin dissociation curve S-shaped?

1. AHaemoglobin can bind only one oxygen molecule
2. BRed cells change size as they take up oxygen
3. COxygen dissolves better in plasma at high partial pressure
4. DBinding of one oxygen makes the next bind more easily

Which hormone is released by the adrenal cortex in response to ACTH?

1. AAldosterone, as the main response
2. BAdrenaline
3. CCortisol
4. DThyroxine

Which mechanism mainly creates the concentration gradient in the medulla of the kidney?

1. ASecretion of urea into the proximal tubule
2. BThe countercurrent multiplier of the loop of Henle
3. CADH acting on the descending limb
4. DGlomerular filtration

Which adaptation develops over days to weeks at high altitude?

1. ALower ventilation to save oxygen
2. BIncreased renal bicarbonate retention
3. CHigher erythropoietin levels and more red blood cells
4. DA fall in haematocrit