Human physiology worksheet with answers

In which direction does oxygen move during gas exchange in the lungs?

1. AFrom the alveoli into the blood
2. BFrom the blood into the alveoli
3. CFrom the blood into the bronchi
4. DFrom the pleura into the blood

What does bile do to fats in the small intestine?

1. AEmulsifies them into small droplets
2. BAbsorbs them directly into the blood
3. CConverts them into glucose
4. DBreaks them into amino acids

Which pituitary hormone stimulates the thyroid gland?

1. AAdrenocorticotropic hormone (ACTH)
2. BGrowth hormone (GH)
3. CLuteinising hormone (LH)
4. DThyroid-stimulating hormone (TSH)

What is anatomical dead space?

1. AThe space between the two pleural layers
2. BThe volume of the conducting airways where no gas exchange happens
3. CAlveoli that have collapsed completely
4. DThe air that stays in the lungs after full exhalation (residual volume)

Where does the final activation step of vitamin D (1-alpha hydroxylation) take place?

1. AKidney
2. BLiver
3. CSkin
4. DSmall intestine

During which phase of the cardiac cycle are all four heart valves closed while ventricular pressure rises?

1. ARapid filling
2. BAtrial systole
3. CRapid ejection
4. DIsovolumetric contraction

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

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

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

1. AThe vagus nerve speeds up the heart
2. BNerves pass signals to their targets by releasing a chemical
3. CThe heart beats without any nerve supply
4. DNerve impulses spread through the fluid directly as electricity