The blood-brain barrier
1.results from microglia signaling adjacent cells of the brain capillaries to form tight junctions.
2.prevents most water soluble substances from moving between the blood and the interstitial fluid of the brain.
3.allows glucose to diffuse across the capillary walls.
4. allows changes in plasma potassium levels to cause corresponding changes in brain interstitial fluid potassium levels.
5. All of these are correct
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The number of sperm cells ejaculated at one time is about:
a. 100,000–200,000 b. 300 million–500 million c. 1 million–3 million d. 3 million–5 million
What does oxygen deficit represent?
A) amount of energy needed for exertion B) the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used C) the amount of oxygen taken into the body prior to the exertion D) the amount of oxygen taken into the body immediately after the exertion
Depolarization occurs because....
What will be an ideal response?
The bacterium, Clostridium difficile,
A) Is readily treated with drugs. B) Is dangerous because it causes severe digestive dysfunction. C) Is outcompeted by ingesting "good" bacteria. D) A and B