The Human Skeletal System Interesting Facts About Our Skeletal System

HUMAN BODY SYSTEM DIAGRAM :

The problem is most of us are not curiosity seekers when it comes to the human body, particularly the skeletal system. Probably the total knowledge of what the average persons knows about this system, could be written in one paragraph.

The Human Skeletal System - Interesting Facts About Our Skeletal System

Now switching over to another topic just for a moment, let me talk about curiosity. We are nosy creatures by habit, and thrive on learning interesting things. It doesnt matter on what topic for the most part, if has something to do with us either direct or indirectly, then we want to here it. Only however if it simple to understand.

Now back to the skeletal system. This is definitely all about us, in fact it is us. Its not up to someone else to look after what belongs to us. The human anatomy is really not nearly as complex as we make it out to be. That statement only holds true for those that are not doing an in-depth study of the body. In those cases, yes it is complex, but not beyond understanding. Its just a matter of how much knowledge is necessary for the purpose we need it for. So in the case of the individual that wants to go into the medical profession, he needs a lot more knowledge than the average person who just want to take care of what he owns. Namely our body.

So not only are we going to talk about some interesting facts about your bones, we are going to learn some things that are important to our everyday living. Do you know that you have been losing things from your skeletal system over the years?

When you were born you had about 350 brand new bones. Now if you could peek inside yourself youd count around 206 or so. Thats 90 less then what you started with. You know darn well you havent had any surgery that removed 90 of your bones, and you also know that you were born perfectly healthy. This truly is a mystery, and now youre curious. Well actually it really isnt all that much of a mystery. Many of our bones simply fuse together throughout out lifespan. Part of the reason this happens is so those bones fusing together, can perform the functions we need as adults, which we didnt require as children.

Here is another point that may be of interest. Most of us reach our peak bone density or strength around the age of 20. So the adage that its "all down hill after 40" is misleading. Now dont let this thought depress you, and lead you to think that now that youre past twenty that you are past the prime of you life. It simply means that you need to ensure you are taking care of your body. particularly your skeletal system right from that age on. Not waiting till you reach 40 before you start thinking about whats good for your bones.

Lets cover one more interesting fact. There are so many to choose from its hard to decide which to share with you. How about those starvation diets that many of us have tried at some point in our life. We figure whatever damage they could cause is temporary right? Not so. you are damaging your bones because they are not being nourished properly. Who knows what lasting effects this could have.

So a little bit of basic knowledge about the body can mean a lot of good health through the years. You have to admit that some of the facts we covered here were quite interesting and did raise your curiosity.

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Female reproductive system

The female reproductive system is illustrated to the right. “Eggs” are produced in the ovaries, but remember from our discussion of meiosis, that these are not true eggs, yet, and will never complete meiosis and become such unless/until first fertilized by a sperm. Within the ovary, a follicle consists of one precursor egg cell surrounded by special cells to nourish and protect it. A human female typically has about 400,000 follicles/potential eggs, all formed before birth. Only several hundred of these “eggs” will actually ever be released during her reproductive years. Normally, in humans, after the onset of puberty, due to the stimulation of follicle-stimulating hormone (FSH)one “egg” per cycle matures and is released from its ovary. Ovulation is the release of a mature “egg” due to the stimulation of leutenizing hormone (LH), which then stimulates the remaining follicle cells to turn into a Corpus luteum which then secretesprogesterone to prepare the uterus for possible implantation. If an egg is not fertilized and does not implant, the corpus luteum disintegrates and when it stops producing progesterone, the lining of the uterus breaks down and is shed.
Each “egg” is released into the abdominal cavity near the opening of one of the oviducts or Fallopian tubes. Cilia in the oviduct set up currents that draw the egg in. If sperm are present in the oviduct (if the couple has recently had intercourse), the egg will be fertilized near the far end of the Fallopian tube, will quickly finish meiosis, and the embryo will start to divide and grow as it travels to the uterus. The trip down the Fallopian tube takes about a week as the cilia in the tube propel the unfertilized “egg” or the embryo down to the uterus. At this point, if she had intercourse near the time of ovulation, the woman has no idea whether an unfertilized “egg” or a new baby is travelling down that tube. During this time, progesterone secreted by the corpus luteum has been stimulating the endometrium, the lining of the uterus, to thicken in preparation for possible implantation, and when a growing embryo finally reaches the uterus, it will implant in this nutritious environment and begin to secrete its own hormones to maintain the endometrium. If the “egg” was not fertilized, it dies and disintegrates, and as the corpus luteum also disintegrates, its progesterone production falls, and the unneeded, built-up endometrium is shed.
The uterus has thick, muscular walls and is very small. In a Nulliparous woman, the uterus is only about 7 cm long by 4 to 5 cm wide, but it can expand to hold a 4 kg baby. The lining of the uterus is called the Endometrium and has a rich capillary supply to bring food to any embryo that might implant there.
The bottom end of the uterus is called the Cervix The cervix secretes mucus, the consistency of which varies with the stages in her menstrual cycle. At ovulation, this cervical mucus is clear, runny, and conducive to sperm. Post-ovulation, the mucus gets thick and pasty to block sperm. Enough of this mucus is produced that it is possible for a woman to touch a finger to the opening of her vagina and obtain some of it. If she does this on a daily basis, she can use the information thus gained, along with daily temperature records, to tell where in her cycle she is. If a woman becomes pregnant, the cervical mucus forms a plug to seal off the uterus and protect the developing baby, and any medical procedure which involves removal of that plug carries the risk of introducing pathogens into the nearly-sterile uterine environment.
The vagina is a relatively-thin-walled chamber. It servs as a repository for sperm (it is where the penis is inserted), and also serves as the birth canal. Note that, unlike the male, the female has separate opening for the urinary tract and reproductive system. These openings are covered externally by two sets of skin folds. The thinner, inner folds are the Labia Minora and the thicker, outer ones are the labia majora. The labia minora contain erectile tissue like that in the penis, thus change shape when the woman is sexually aroused. The opening around the genital area is called the vestibule. There is a membrane called the Hymen that partially covers the opening of the vagina. This is torn by the woman’s first sexual intercourse (or sometimes other causes like injury or some kinds of vigorous physical activity). In women, the openings of the vagina and urethra are susceptible to bacterial infections if fecal bacteria are wiped towards them. Thus, while parents who are toilet-training a toddler usually wipe her from back to front, thus “imprinting” that sensation as feeling “right” to her, it is important, rather, that that little girls be taught to wipe themselves from the front to the back to help prevent vaginal and bladder infections. Older girls and women who were taught the wrong way need to make a conscious effort to change their habits.
At the anterior end of the labia, under the pubic bone, is the Clitoris the female equivalent of the penis. This small structure contains erectile tissue and many nerve endings in a sensitive glans within aprepuce which totally encloses the glans. This is the most sensitive point for female sexual stimulation, so senstiive that vigorous, direct stimulation does not feel good. It is better for the man to gently stimulate near the clitoris rather than right on it. Some cultures do a procedure, similar to circumcision, as a puberty rite in teenage girls in which the prepuce is cut, exposing the extremely-sensitive clitoris. There are some interesting speculations on the cultural significance of this because the sensitivity of the exposed clitoris would probably make having sexual intercourse a much less pleasant experience for these women.

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