Which causes vasoconstriction? a. α-Adrenergic antagonist b. Calcium channel blocker c. Acetylcholine d. Norepinephrine

Option D) Norepinephrine

Explanation:

Norepinephrine, also known as noradrenaline acts as both a hormone and neurotransmitter.

Its effects is similar to epinephrine, in that during stress conditions epinephrine stimulates the heart to beat and pump blood faster, while norepinephrine helps to maintain blood pressure, causing the narrowing of the blood vessels, known as vasoconstriction.

each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.

it is either c or d and i know for sure it is not a or b