The mammalian spermatozoon is a uniquely shaped cell with a head containing the nucleus and enzyme-filled acrosome, and a flagellum (tail) containing contractile apparatus such as the axoneme, cytoskeletal structures and mitochondria. The shape of the sperm head varies from species to species and...
What is the process by which the sperms are produced called?Question:What is the process by which the sperms are produced called?Gametes:Many multicellular organisms have two major types of cells, which are the somatic cells and the gametes. Somatic cells are the cells found throughout the...
What is a gland that secretes a milky, slightly acidic fluid that contains several substances that promote viability and motility of sperm?What are the glands that secrete a substance to clear the urethra prior to ejaculation called?An organ which produces spermatozoa is called?
Women are born with all of their oocytes. The oocyte proteome must be maintained with minimal damage throughout the woman’s reproductive life, and hence for decades. Here we report that oocyte and ovarian proteostasis involves extreme protein longevity. Mouse ovaries had more extremely long-lived...
两者都主要捕食各类海兽、海鸟和鱼类为主,根据食性上的差异科学家把这一类偏向掠食性的抹香鲸类划归到一个专门的类群之中——巨猎食性抹香鲸类/掠食性抹香鲸类(Macroraptorial Sperm Whale)。 在这个分类单元中除了像尖喙鲸这样的中小型成员外还有梅氏利维坦鲸、颧突抹香鲸、噬抹香鲸这样更大型的物种,另外在有些时候这...
1). Additionally, cell-in-cell phenomena are characteristic of non-cancer cell types during development. Sperm and egg can fuse, forming a zygote. Around 5–6 days after the first cell division of a human embryo, some of the mother’s (uterine epithelial) cells enter the fetus (...
Janecek. This species is widely distributed in Australia and is a facultative producer of the cyanotoxin cylindrospermopsin (Shaw et al., 1999), hence its accurate identification is critical to support management strategies to minimize the risk of human exposure to the toxin. Interestingly, the ...
He agreed that childhood was important, but he emphasized ongoing social tensions, not sexual ones, as most crucial to the formation of personality. Inferiority complex (What Is an Inferiority Complex?) An inferiority complex encompasses feelings of inadequacy or inferiority. These feelings may result...
Answer to: Fill in the blank. The hormone that stimulates the release of growth hormone is called ___. By signing up, you'll get thousands of...
Oogenesis is the process by which a secondary oocyte ( ovum) is formed from the oogonial cells of the ovary. In females, oogenesis begins during the intrauterine period itself. The immature oocytes are present inside an ovarian follicle. The formation of the ovarian follicles ...