Meninges- three layers of connective tissue
1) Dura Mater: tough top layer
2) Arachnoid Mater: middle; collagen/elastic fibers; spiderweb effect
3) Pia Mater: delicate and thin; bottom transparent layer made up of elastic/collagen fibers; blood vessels
The diaphragm moves upward, making the chest cavity larger, and air flows in.
Norepinephrine is released from sympathetic nerves, causing the heart rate to increase to higher values.
<h3>What is Norepinephrine?</h3>
Norepinephrine is a neurotransmitter (i.e., a chemical messenger) which is well known for sending information to the brain in order to increase alertness during some particular situation and also serve to constrict blood vessels.
In conclusion, norepinephrine is released from sympathetic nerves, causing the heart rate to increase to higher values.
Learn more about Norepinephrine here:
brainly.com/question/13753173
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