Aqueous channels in the tight junctions between adjacent epithelial cells allow the passage of some water-soluble substances. Neutral or uncharged, i.e. nonpolar, molecules pass most readily since the pores are electrically charged. Within the alimentary tract, channels are largest and most numerous in jejunal epithelium and filtration allows for rapid

6 Most drugs have a molecular weight of less than 600 (e.g. diazepam 284, morphine 303) but some have more (erythromycin 733, digoxin 780).


Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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