sex hormones
A shortage of cholesterol is essentially impossible, since your body is capable of making all it needs from simpler molecules. Anyone lacking the genes that produce the enzymes required to do this would not even live long enough to be born, since it's important in the development of the brain and central nervous system.
Spindle formation or assembly.
Yes those would not interact. Ibuprofen is a non-steroidal anti-inflammatory pain medicine. It has no effect on cholesterol, so it doesn't interfere with the cholesterol drugs. Remember that ibuprofen does tend to be harsh on the stomach. Eat before you take it.
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There is no mention of grapefruit on the label. It mentions orange juice. The only way that their would be grapefruit in it would be if it is classified under "natural flavors". Ask your doctor or pharmacist if it will interfere with your medications.
A factor that would add to a housing shortage is a shortage of skilled labor. Building homes requires architects, contractors, masonaries, electricians, plumbers, and more.
It would interfere with ability to urinate. This is extremely painful and can be fatal.
The term "shortage" is used to describe a situation where there is a lack of something. For example, during a drought, the newspapers would report this as a "water shortage".
Acetylcholine release is necessary for skeletal muscle contraction, because it serves as the first step in the process, enabling the subsequent cross-bridge formation. A muscle's ability to contract depends on the formation of cross-bridges between myosin & actin filaments. A drug that blocks acetylcholine release would interfere with this cross-bridge formation and prevent muscle contraction
Damage to choroid plexus would interfere with the production of CSF (cerebrospinal fluid).
If there was a shortage of books at the library you would read all of them and have no books to read anymore.
You can learn more about cholesterol level at http://www.christianet.com/cholesterol/index.htm. It has everything you would need to know about cholesterol including the normal and healthy level of cholesterol.