Human physiology worksheet with answers

Which hormone, released by the stomach lining, stimulates gastric acid secretion?

1. AGastrin
2. BGlucagon
3. CInsulin
4. DSecretin

What is stroke volume?

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

The systolic blood pressure is the pressure in the arteries:

1. ABetween two heartbeats, during diastole
2. BWhen the ventricles contract
3. CWhen the ventricles relax
4. DWhen the atria contract

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

1. AInsulin release from the endocrine pancreas
2. BBicarbonate secretion from the pancreas
3. CAcid secretion from the stomach
4. DContraction of the gallbladder

What is the main effect of aldosterone on the kidney?

1. ASodium reabsorption and potassium secretion in the distal nephron
2. BWater reabsorption by inserting aquaporins only
3. CGlucose reabsorption in the proximal tubule
4. DIncreased filtration in the glomerulus

Which hormone increases water reabsorption in the collecting ducts of the kidney?

1. AAldosterone
2. BAntidiuretic hormone (ADH)
3. CParathyroid hormone
4. DAtrial natriuretic peptide

Why does fetal haemoglobin have a higher affinity for oxygen than adult haemoglobin?

1. AIt has five subunits instead of four
2. BFetal blood has a higher pH
3. CIt contains more iron per haem
4. DIt binds 2,3-BPG less strongly

In Otto Loewi's classic experiment, fluid from a vagus-stimulated frog heart slowed a second heart. What did this show?

1. ANerves pass signals to their targets by releasing a chemical
2. BThe vagus nerve speeds up the heart
3. CNerve impulses spread through the fluid directly as electricity
4. DThe heart beats without any nerve supply