Biology, 10.03.2020 08:57 rosemarybooker

"The neurotransmitter (and hormone) induces an increase in intracellular cyclic adenosine monophosphate (cAMP) which is also associated with an increase in intracellular concentration, which ultimately increases heart rate

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Answer from: genyjoannerubiera

Norepinephrine

Messenger

Explanation:

Norepinephrine ( NE ), also called noradrenaline ( NA ) or noradrenalin ,

is an organic chemical in the catecholamine family that functions in

the brain and body as a hormone and neurotransmitter.

In the rest of the body, norepinephrine increases heart rate

and blood pressure , triggers the release of glucose from energy

stores, increases blood flow to skeletal muscle , reduces blood flow

to the gastrointestinal system, and inhibits voiding of the bladder

and gastrointestinal motility.

Intracellular

concentrations

of cAMP play an

important

second

messenger role

in regulating

cardiac muscle

contraction.

Activation of the

sympathetic

nervous system

releases the

neurotransmitter

norepinephrine

and increases

circulating catecholamines (epinephrine and norepinephrine).

Answer from: Quest

i think the answer would be d

Answer from: Quest

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.

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