Examlex
A photon that is emitted during a transition in hydrogen from the n = 27 state to the n = 2 state is in which of the following series?
Estrogen
A group of steroid hormones that play an essential role in the regulation of the reproductive and menstrual cycle.
Progestin
A synthetic form of progesterone used in contraceptives and hormone therapy.
Vasectomy
A permanent method of birth control in which each vas deferens is severed or blocked off, thereby preventing sperm from entering the vas deferens and mixing with seminal fluids to form semen.
Prostate Gland
A muscular gland encircling the urethra that produces about one third of the seminal fluid.
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