Which of the following is the most significant source of blood flow resistance?
a) blood vessels typeb) blood viscosityc) total blood vessel lengthd) blood vessel diameter

Which muscle is responsible for inhalation ?

Duchenne muscular dystrophy is a serious condition caused by a recessive allele of a gene on the human x chromosome. the patients have muscles that weaken over time because they have absent or decreased dystrophin, a muscle protein. they rarely live past their twenties. how likely is it for a woman to have this condition? a) women can never have this condition.b) one-fourth of the daughters of an affected man would have this condition.c) one-half of the daughters of an affected father and a carrier mother could have this condition.d) only if a woman is xxx could she have this condition.

What is the problem in this article? what solution does the article propose?