Animal Cell Mitosis
Some mitotic spindle fibers elongate from the centrosomes and attach to kinetochores, protein bundles at the centromere region on the chromosomes where sister chromatids are joined
Interactive Eukaryotic Cell Model
Smooth ER plays different functions depending on the specific cell type including lipid and steroid hormone synthesis, breakdown of lipid-soluble toxins in liver cells, and control of calcium release in muscle cell contraction. Smooth Endoplasmic Reticulum: Throughout the eukaryotic cell, especially those responsible for the production of hormones and other secretory products, is a vast network of membrane-bound vesicles and tubules called the endoplasmic reticulum, or ER for short
The animal kingdom is unique among eukaryotic organisms because most animal tissues are bound together in an extracellular matrix by a triple helix of protein known as collagen. The process of cell fractionation enables the scientist to prepare specific components, the mitochondria for example, in large quantities for investigations of their composition and functions
Chromosome 18 - Genetics Home Reference
A banding pattern is the characteristic pattern of dark and light bands that appears when a chromosome is stained with a chemical solution and then viewed under a microscope. Researchers believe that extra copies of some genes on chromosome 18 disrupt the course of normal development, causing the characteristic features of trisomy 18 and the health problems associated with this disorder
as pal Cara Delevingne coins their couple name The new Brangelina! Fancy seeing you here! David Beckham works up a sweat at SoulCycle class with pal Gordon Ramsay's wife Tana It's a celeb favourite Irina Shayk bares her cleavage in racy and sheer cut-out gown as she leads the glamour at star-studded Leonardo DiCaprio charity gala in St. Video of orphan Lucy melts the hearts of Houston family Passenger is beaten up whilst on board on flight to Russia Church goers watch the picture of Mary as they sit through..
Preventing HPV-Caused Cancers What are human papilloma viruses, why do they cause cervical cancer, and how well does the HPV vaccine work? Tracking Disease Outbreaks How do epidemiologists figure out the role of low vaccination rates in preventable diseases like measles or pertussis? What is Herd Immunity? When enough people are immune to a disease, the "herd" protects those who cannot safely receive a vaccine. Launch Interactive Printable Version Explore the stages of two types of cell division, mitosis and meiosis, and how these processes compare to one another
Male Reproductive System
Although circumcision is not medically necessary, parents who choose to have their children circumcised often do so based on religious beliefs, concerns about hygiene, or cultural or social reasons. The male genitals include: the testicles the duct system, which is made up of the epididymis and the vas deferens the accessory glands, which include the seminal vesicles and prostate gland the penis In a guy who's reached sexual maturity, the two testicles (pronounced: tes-tih-kulz), or testes (pronounced: tes-teez), produce and store millions of tiny sperm cells
According to the press releasevii: "Dr Jonathan Samet (University of Southern California, USA), overall Chairman of the Working Group, indicated that "the evidence, while still accumulating, is strong enough to support a conclusion and the 2B classification. The information on this website is not intended to replace a one-on-one relationship with a qualified health care professional and is not intended as medical advice
Sexual Reproduction
The tranquilizer, thalidomide, taken by many pregnant European women between 1954 and 1962, turned out to be a potent teratogen and was responsible for the birth of several thousand deformed babies. Virus infection of the mother, e.g., by rubella ("German measles") virus or exposure to certain chemicals may cause malformations in the developing embryo
Neuroscience For Kids - cells of the nervous system
Neurons can be quite large - in some neurons, such as corticospinal neurons (from motor cortex to spinal cord) or primary afferent neurons (neurons that extend from the skin into the spinal cord and up to the brain stem), can be several feet long! Happy 115th Birthday to the Golgi apparatus! In 1898, the famous neuroanatomist Camillo Golgi reported his discovery of a ribbon-like apparatus inside neurons of the cerebellum
The nucleus takes up most of the volume of the sperm cell's head, and, unlike the nuclei of other cells in the male body, is haploid, meaning that in humans it contains 23 single chromosomes instead of 23 paired chromosomes. The Head The head of a spermatozoon, which is flattened and measures about 5 micrometers long by 3 micrometers at its widest point where it meets the neck, has two main features -- the acrosome and the nucleus
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