HomeDiscussion Forumscience homework pleasee help!!!!!!!!!!!!!!?

science homework pleasee help!!!!!!!!!!!!!!?

The ____ gland produces melatonin, a hormone that may regulate wake/sleep patterns.
* pineal
* pituitary
* adrenal
* thyroid
The developing embryo receives nutrients and oxygen from the mother’s ____.
* ovaries
* oviduct
* blood
* lymph
Hormones produced by the ____ gland cause changes in the body during puberty.
* thyroid
* thymus
* pituitary
* none of the above
After fertilization, the zygote divides and is implanted in the _____.
* uterus
* oviduct
* ovary
* vagina
Identical twins have the same set of ____.
* cells
* genes
* organs
* tissues


  1. -Pineal Gland produces
    – Dimethyltryptamine
    – Melatonin
    The pineal gland (also called the pineal body, epiphysis cerebri, epiphysis or the “third eye”) is a small endocrine gland in the vertebrate brain. It produces melatonin, a hormone that affects the modulation of wake/sleep patterns and photoperiodic (seasonal) functions.
    The embryo takes nourishment and oxygen and releases waste products through the umbilical cord, which links it with the placenta. The umbilical cord contains three blood vessels through which the embryo’s blood circulates to and from the placenta.
    The embryo receives, through the vein in the umbilical cord, fresh nutrients (oxygen, amino acids, sugar, fats, and minerals) from the mother’s bloodstream, and hormones, antibodies, and other necessary substances by the same route.
    Luteinizing hormone (LH) plays an important role in sexual development and is produced by the pea-sized pituitary gland near the brain. An LH test measures the level of this hormone in the bloodstream.
    In kids, LH levels are high right after birth, but then fall, remaining low until puberty approaches (usually between ages 10 and 14). At this time the hypothalamus, an almond-sized area of the brain that links the nervous system with the hormone-producing endocrine system, releases gonadotropin-releasing hormone (GnRH) that starts the changes of puberty. GnRH signals the pituitary gland to release two other puberty hormones into the bloodstream: LH and follicle stimulating hormone (FSH).
    In boys, LH and FSH work together to get the testes to begin producing testosterone, the hormone responsible for the physical changes of puberty and the production of sperm.
    In girls, LH and FSH prompt the ovaries to begin producing the hormone estrogen, which causes a girl’s body to mature and prepares her for menstruation.
    Because LH and FSH work so closely with each other, doctors often perform these tests together, as well as tests for testosterone (the major male sex hormone) and estradiol (a form of estrogen, the major female sex hormone). Taken together, the results can often provide a more complete picture of a child’s sexual maturation, and the well-being of the glands that produce these hormones
    Zygote is the name given to the ball of cells that will eventually become an embryo, and ultimately a foetus. It is formed shortly after the fertilization of the woman’s ovum (or egg).
    From the many millions of sperm that make their way to the woman’s ovum, it takes just one to fertilize the egg. As soon as the sperm penetrates the ovum, the tail of the sperm separates from the head, a cell begins, and the zygote is formed.
    Once created, the zygote then divides into two cells, then four, eight, sixteen and so on. As the zygote continues its journey along the fallopian tube, it continues to divide and multiply cells, although the zygote does not actually increase in size.
    After around four days, the zygote becomes known as a morula, and is basically a solid cluster of cells. A week after fertilization, this dense ball of cells reaches the uterus.
    Now known as a blastocyst, this cluster of cells starts to attach to the uterine wall, and embed deep into the lining of the womb. This process is known as implantation.
    Once implanted, the blastocyst will begin to develop an outer layer, which will become the placenta; and an inner layer, which will become the embryo.
    Normally twins develop from one egg which splits early in development, creating identical twins who share all of their genetic material, or they are the product of two separate eggs fertilised by two different sperm, creating non-identical (fraternal) twins – who share on average 50% of their genetic material. Sometimes, two sperm can fertilise a single egg, but this is only thought to happen in about 1% of human conceptions.


Please enter your comment!
Please enter your name here