By John K Young; Recorded Books, Inc

During this direction, Howard college professor John okay. younger seems at how the human physique is built and the way it may malfunction if now not safely maintained. those lectures deal with not just the elemental anatomical bones and organs that represent the human shape, but additionally the function each one performs within the synchronized attempt to maintain us alive.

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New York: FranklinWatts, 1994. , et al. ” Journal of Clinical Investigation. Vol. 115, pp. 3484–3493, 2005. , et al. ” Genome Biology. Vol. 7, pp. R72–R77, 2006. , et al. ” Arthritis and Rheumatism. Vol. 56, pp. 2211–2215, 2007. , et al. ” Cell. Vol. 127, pp. 1123–1135, 2006. 53 Lecture 11: The Respiratory System The Suggested Reading for this lecture is Elaine N. Marieb, Jon Mallatt, and Patricia Brady Wilhelm’s Human Anatomy (chapter 21). Nasal Cavity LECTURE ELEVEN Pharynx Nasal Cavity Larynx Trachea These flaps of bone also cover over openings (meatuses) in the lateral walls of the nasal cavity that let air into the so-called paranasal sinuses, air-filled cavities that project away from the nasal cavity.

Normally, our brains and retinas routinely “ignore” this insensitive area of the retina so that we are not even aware of it. One challenge in understanding the eye is the question of how such a complex structure ever evolved. What were the precursors of the eye, and did they function as some kind of more primitive eyes? Moreover, flies, octopuses, and mammals all have eyes with very different-appearing structures. Did they evolve independently? Even Darwin was troubled by these questions. More recently, however, it has been determined that all creatures with eyes, even jellyfish with very primitive light-sensing organs, seem to share the same kinds of genes with all other visual organisms.

Nerve cells in the hypothalamus regulate body temperature, sexual behavior, appetite, drinking behavior, sleep, and the secretion of hormones from the pituitary gland. It has recently been found that specific nerve cells in the hypothalamus, which contain a neurotransmitter called orexin, mysteriously die in some individuals. This causes affected patients to develop a condition called narcolepsy, which causes them to fall asleep frequently in the daytime. Another cluster of nerve cells is larger in males than in females and may be responsible for modulating male sexual behavior.

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