widgetkvm.blogg.se - The Reproductive System by Alvin Silverstein

5Ĭhemical exposure and assisted reproductive technology – Exposure to high levels of flame retardants 6 and plasticizers 7 may have a negative impact on the outcomes of in vitro fertilization (IVF), a technology used to help people get pregnant. Heavy lifting or shift work and decreased fertility – Two occupational factors for women – lifting heavy loads or working non-daytime schedules – are associated with fewer eggs in their ovaries, which could indicate decreased fertility. NIEHS conducts and funds research to understand environmental factors that may affect human reproductive health. Exposure to endocrine-disrupting compounds, chemicals that interfere with the body’s hormones, may contribute to problems with puberty, fertility, and pregnancy.

Exposure to diethylstilbestrol (DES), a drug once prescribed to women during pregnancy, can lead to increased risks in their daughters of cancer, infertility, and pregnancy complications.

Mercury exposure has been linked to issues of the nervous system like memory, attention, and fine motor skills.

Exposure to lead is linked to reduced fertility in both men and women.

Research shows exposure to environmental factors could affect reproductive health in the following ways: With this book, your key to the world of single-celled organisms, youll learn fascinating lessons about how these strange animals eat, reproduce, and defend themselves.Scientists believe environmental factors likely play a role in some reproductive disorders.

Youll also meet the euglena, classified as both plant and animal the rotifer, a creature with two wheels of whirling hairlike projections that help it move by squeezing in and out like an accordion and the incredible hydra, a fearsome bully that constantly threatens other small animals with its crown of grasping tentacles. Youll trace the path of a blob-like amoeba as it stretches out its pseudopods to hunt and gobble up its prey, and youll see the life-or-death water ballet of a slipper-shaped paramecium as it swims away from its mortal enemy, the pincushion-shaped suctorian. And with the help of this book and a microscope, you can bring these tiny creatures into focus and discover the ways in which they live. Book Synopsis Within every drop of pond water lurks an invisible world, alive with an amazing variety of microscopic animals. Easy-to-understand language, 37 illustrations. About the Book Fascinating introduction to the world of single-celled organisms recounts the feeding, reproductive, and defensive strategies employed by an array of curious creatures: amoeba, paramecium, suctorian, hydra, others.