Question 4 Answer: Dopamine, norepinephrine, and epinephrine are a group of neurotransmitters called catecholamines. Catecholamines are synthesized from tyrosine, an amino acid (1). Structurally, “they all have an amino group (—NH2—NH2) and a catechol ring composed of six carbons and two adjacent hydroxyl (—OH—OH) groups” (1). These catecholamines, “may cause either excitation or inhibition, depending on the type of metabotropic receptor at the synapse” (1). Norepinephrine is produced in the adrenal glands and “plays roles in arousal (awakening from deep sleep), dreaming, and regulating mood. A smaller number of neurons in the brain use epinephrine as a neurotransmitter” (1). Dopamine is responsible for our emotional responses, pleasure …show more content…
Tortora, G. & Derrickson, B. (2017). Principles of Anatomy and Physiology, 15th ed. New York: John Wiley & Sons Inc. p 435, 568. 2. Cepeda, C., Murphy, K. P. S., Parent, M., & Levine, M. S. (2014). The Role of Dopamine in Huntington’s Disease. Progress in Brain Research, 211, 235–254. http://doi.org/10.1016/B978-0-444-63425-2.00010-6 Question 1 Addition: Hi Doree and Maggie, I wanted to add to both your posts about muscle naming. Maggie, I really enjoyed reading about how the Ancient Greeks started naming body parts, and the examples given, so I decided to look for more. Tragus is “a tiny flap of skin on the outer ear. It's named after goats, not because it looks like them, but because some people have tufts of hair on the tragus like goats do on their chins” (1). Crista galli, we learned is a projection of the ethmoid bone. “Roughly translated, crista galli is Latin for crest of the rooster” (1). Galea, is Greek for helmet (2). The galea aponeurotica is a tough fibrous sheet of connective tissue that “covers the superior and lateral surfaces of the skull” (2). The fibula got its name from the Greek word for needle describing a slender bone (3). The falx cerebri is, “the membrane that separates the two sides of the brain” (2) comes from the word falx which means sickle in Greek