What are the layers of bony matrix in compact bone tissue called?

Lipids are hydrophobic, and do not usually dissolve in water. Because blood is water-based, the lipid cholesterol is combined with ________ so that it can be transported by blood.

A) a hydrophilic molecule B) a cation C) an anion D) a hydrophobic molecule E) nothing; cholesterol is not transported in blood

The _________ phase of a cardiac action potential is associated with calcium influx while the ______ phase is associated with potassium efflux

Fill in the blank(s) with correct word

The most common blood type in the United States is:

a. A negative b. A positive c. O negative d. O positive

All of these will easily diffuse across the plasma membrane EXCEPT:

A. oxygen B. carbon dioxide C. steroid hormone D. glucose