Muscles located in the walls of the small intestine push digested material along. muscles located in the walls of arteries push blood along. based on this info, which of tje following statements are correct? a both sets of muscles are involuntary and smooth. b bothe sets of muscles are voluntary and smooth. c both sets of muscles are smooth, although one is voluntary and the other set is involuntary. d both sets are voluntary although one is striated and the other set is smooth

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation: