Reproductive System

Testosterone, follicle-stimulating hormone (FSH) and luteinizing hormone (LH).

LH stimulates the testicular Leydig cells to produce testosterone.
FSH stimulates the testicular Sertoli cells that nurture the developing sperm cells. Sertoli cells are also dependent testosterone.

It will return to normal about 4 to 6 weeks after the birth.

Ovaries.

A jellyfish does not have any circulatory vessels. They use diffusion as their means of circulation. They do not have a closed circulatory system.

Well, if there is no egg there, then no. It's more a case of whether it manages to fertilise the egg after finding it because it doesn't always do that

It is different for every boy. But it is usually around the age of 11 or 12.

normally around 11 or 12 but if it is earlier or later don't panic everyone goes through puberty at different times

This is the start of an ectopic pregnancy, that is, one that begins anywhere in the body except the uterus. When an embryo starts to grow in the fallopian tube, it quickly runs out of room to expand. At that point, the tube is in danger of rupturing and the mother's life is at risk. Surgery is necessary to prevent an ectopic pregancy from becoming fatal; such a pregancy can never be brought to term.

While some discoloration can be due to skin pigmentation. Other times it can be narrowed down to bruising, disease or personal hygiene such as wiping estament downwards from the rectum rather than up if discoloration occurred recently consult medical advice.

yes

Girls get their periods as a sign their reproductive system is working correctly. The blood is coming from their uterus, and as boys don't have those, they don't get periods

--------------------------------------------------------------------------------------------------------------------

yes but i do ask you don't put anymore questions like this on he site.

Ectopic means "out of place." In an ectopic pregnancy, a fertilized egg has implanted outside the uterus. The egg settles in the fallopian tubes more than 95% of the time. This is why ectopic pregnancies are commonly called "tubal pregnancies." The egg can also implant in the ovary, abdomen, or the cervix, so you may see these referred to as cervical or abdominal pregnancies.

None of these areas has as much space or nurturing tissue as a uterus for a pregnancy to develop. As the fetus grows, it will eventually burst the organ that contains it. This can cause severe bleeding and endanger the mother's life. A classical ectopic pregnancy never develops into a live birth.

What Are the Signs and Symptoms?

Ectopic pregnancy can be difficult to diagnose because symptoms often mirror those of a normal early pregnancy. These can include missed periods, breast tenderness, nausea, vomiting, or frequent urination.

Pain is usually the first red flag. You might feel pain in your pelvis, abdomen, or, in extreme cases, even your shoulder or neck (if blood from a ruptured ectopic pregnancy builds up and irritates certain nerves). Most women describe the pain as sharp and stabbing. It may concentrate on one side of the pelvis, and it may come and go or vary in intensity.

Any of the following additional symptoms can suggest an ectopic pregnancy:

* vaginal spotting or bleeding * dizziness or fainting (caused by blood loss) * low blood pressure (also caused by blood loss) * lower back pain

What Causes an Ectopic Pregnancy?

An ectopic pregnancy results from a fertilized egg's inability to work its way quickly enough down the fallopian tube into the uterus. An infection or inflammation of the tube may have partially or entirely blocked it. Pelvic inflammatory disease (PID) is the most common of these infections.

Endometriosis (when cells from the lining of the uterus detach and grow elsewhere in the body) or scar tissue from previous abdominal or fallopian surgeries can also cause blockages. More rarely, birth defects or abnormal growths can alter the shape of the tube and disrupt the egg's progress.

How Is It Diagnosed?

A blood/serum pregnancy test is usuallly done since it is more sensitive and more accurate than a unine pregnancy test. Then an ultrasound should be done to see if they can locate the pregnancy. Ectopic pregnancy can be confused with ovarian cysts, ovarian torsion, appendcitis, salpingitis (PID), constipation, endometriosis, etc. Often the only way to be 100% sure is to look inside with a laparoscope.

All the answers are in your text books.

You can find the answer here: http://en.wikipedia.org/wiki/Testicle

No it is always the same size regardless of you have sex or not.

The gonad is another name for testicle which is the part of the male body that produces testosterone and sperm.

Urethra in the males serves as a common passage for both urine and sperms.

pink

it is supposed to be up to 72 hrs that sperms remains active....

followimg ovulation, a human egg cell can survive approximately?

24 hours

You cannot become pregnant but you could carry a baby.

It would be theoretically possible, though highly unlikely to cause pregnancy.

The corpus luteum is formed from the ovary. The pituitary gland increases its production of the second hormone, luteinizing hormone (LH). This second hormone allows the mature egg to rupture from the ovary (called ovulation) and enter into the uterine tube. The postovulatory phase has begun. LH also encourages the formation of a "scar" within the ovary. This "scar" is called the corpus luteum, and it produces the hormone progesterone.

after the sperm enters the egg the egg undergoes certain changes in its outer layers preventing any more sperm from entering