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The size of the cervix changes throughout a woman's life cycle. For example, during the fertile years of a woman's reproductive cycle, females tend to have a larger cervix in comparison to postmenopausal females; likewise, females who have produced offspring have a larger sized cervix than females who have not produced offspring. [1]
The human male urethra laid open on its anterior (upper) surface. In the human male, the urethra is on average 18 to 20 centimeters (7 to 8 inches) long and opens at the end of the external urethral meatus. [10] The urethra is divided into four parts in men, named after the location: [10]
The typical adult human bladder will hold between 300 and 500 ml (10 and 17 fl oz) before the urge to empty occurs, but can hold considerably more. [ 3 ] [ 4 ] The Latin phrase for "urinary bladder" is vesica urinaria , and the term vesical or prefix vesico- appear in connection with associated structures such as vesical veins .
The human body consists of biological systems, that consist of organs, that consist of tissues, that consist of cells and connective tissue. The history of anatomy has been characterized, over a long period of time, by a continually developing understanding of the functions of organs and structures in the body.
In male germ cells and spermatozoa, and also in female oocytes, special DNA repair mechanism are present that function to maintain the integrity of the genomes that are to be passed on to progeny. [13] These DNA repair pathways include homologous recombinational repair, non-homologous end joining, base excision repair and DNA mismatch repair. [13]
On 2021, Stephen Quake guessed that the upper limit of the number of human cell types would be around 6000, based on a reasoning that "if biologists had discovered only 5% of cell types in the human body, then the upper limit of cell types to discover is somewhere around 6000 (i.e., 300/0.05)." [10] Other different efforts have used different ...
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During sexual intercourse, sperm cells are ejaculated into the vagina through the penis, resulting in fertilization of an ovum to form a zygote. [1] While normal cells contain 46 chromosomes (23 pairs), gamete cells contain only half that number, and it is when these two cells merge into one combined zygote cell that genetic recombination ...