What is the difference between the atrioventricular

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what is the difference between the atrioventricular and semilunar valves atrioventricular: atria are separated from ventricles semilunar: ventricles are separated 225. what is the first and second heart sound first: beginning of systole, turbulence caused by the closure of mitral and tricuspid valves second: end of systole, the closure of aortic and pulmonic valves 226. what is the general basis of vaccines they implement active immunity mediated by B-lymphocytes 227. what is the gray crescent the gray crescent is the zygote directly after fertilization opposite the point where the sperm entered. this is where the haploid sperm and egg nuclei fuse to form the diploid zygote nucleus 228. What is the point of a refractory period So the action potential proceeds in one direction down the axon 229. what is the relationship between resistance and vessel radius R=1/r^4 230. what is the role of the posterior pituitary gland receives and stores ADH (low blood volume response) and oxytocin (positive feedback contraction hormone) 231. what is the standard E0 of a cell always 0 232. What kind of regeneration is a scar? Incomplete regeneration: the scar does not look and have the same function as the original tissue 233. what level of protein do serine proteases affect? primary 234. what level of protein makes up the active site of an enzyme tertiary structure 235. what makes urine more concentrated? diluted? urine will be concentrated at the bottom of the loop of henle and the collecting duct. after the descending loop of henle, water is reabsorbed into the blood. in the collecting duct, ADH reabsorbs water urine will be dilute in the PCT, DCT, and bowman's capsule . PCT and DCT dont really affect it because they equally reabsorb and secrete ions, but the bowmans capsule and ascending loop of henle reabsorbe ions to make it more dilute 236. What occurs during the first, second, and third trimester First: organogenesis Second: growth, moments, face, elongation Third: brain development, transfer of antibodies to fetus 237. What phase does ovulation occur Metaphase II 238. What physical feature of large systemic arteries (resistance vessels) makes them relatively more responsive to changes in intracellular calcium concentrations? thick tunica media 239. what supports the fetus before placenta yolk sac
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240. What triggers oogenesis and what triggers spermatogenesis Oogenesis: follicle stimulating hormone (FSH) stimulates development of ovarian follicles, luteinizing hormone( LH) causes ovulation Sperm: FSH stimulates Sertoli cells and spermoneogeneis. LH triggers testosterone production 241. what type of DNA sequence makes the best candidate for enzymatic action by a restriction endonuclease see if the beginning and ending bases of the strand are complementary to each other 242. what type of energy storage from fatty acids is preferred in the human body saturated is best, less cis bonds-> they makes it harder to pack 243. what type of sweating and urination would a patient with sarin poisoning have? increased both. an excess of acetylcholine will lead to activation of all parasympathetic neurons, and will contract the bladder and increase sweat 244.
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