Sickle-cell anemia is a genetic disease involving a single gene. Normal homozygous (SS) have normal blood, these individuals become very ill from the malaria parasite and many die. Individuals homozygous for the sickle-cell trait (ss) individuals often die because of the genetic defect. Individuals with the heterozygous condition (Ss) have some sickling of red blood cells, but generally not enough to cause mortality. In addition, malaria cannot survive well within these “partially defective” red blood cells thus, heterozygotes tend to survive.  If 9% of an African population is born with a severe form of sickle-cell anemia, what proportion of the population is likely to become very ill from the malaria parasite?

Acetylcholine causes glycogen breakdown in the liver.

Oligodendrocytes are the most abundant of the glial cells.

Receptors respond to commands from the effectors.

An anticholinergic drug is considered parasympatholytic.

Oligodendrocytes are the most abundant of the glial cells.

Norepinephrine binds to muscarinic receptors.

Epidural anesthesia is introduced to the epidural space between the ________ to block pain signals during pregnancy.

Which of the following occurs during an action potential? (efflux=out; influx=in)1. Na+ efflux, 2. Na+ influx, 3. K+ influx, 4. K+ efflux, 5. depolarization

A nerve that contains only efferent fibers is called a(n)