Thursday, June 28, 2012

Functions of the Thyroid Gland: The Thyroid Gland Produces Two ...

The thyroid gland produces two main hormones, thyroxine and triiodothyronine and calcitonin minor. The release of thyroxine and triiodothyronine is controlled by the hypothalamus and TSH secreted by the adenohypophysis of the pituitary gland. Thyroxine and triiodothyronine are stored in the thyroid follicles and released as needed to control the body's metabolic rate. Specifically, they act to increase the rate of protein synthesis and the rate of release of energy from carbohydrates. They also regulate the growth rate in young and are associated with sexual maturity and early maturation of the nervous system. Van De Graaff: Human Anatomy, Sixth Edition V. FIGURE 14.18 Integration and Coordination Actions of parathyroid hormone. Increased levels of parathyroid hormone causes bones to release calcium from the kidneys to retain calcium, which would otherwise be lost in the urine, and small intestine to absorb calcium. Negative feedback of calcium in the blood inhibits the increased secretion of this hormone.

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Friday, June 22, 2012

Medical marijuana does not increase teen drug use

Macgregor Campbell, consultant

131545607.jpg(Image: David Young-Wolff/Getty Images)

Teens in the US are smoking more pot, but don't blame medical marijuana. A recent survey of risky behaviour in teens indicates that while marijuana use has risen in recent years, the increase is not due to the drug's legalisation for medical purposes.

Marijuana use is currently legal?for medicinal purposes?in 17 US states, but the federal government still regards the drug as an illegal substance. Federal officials have recently increased efforts?to shut down legal marijuana dispensaries deemed to be too close to schools and universities.

A team of three economists led by Daniel Rees?of the University of Colorado at Denver analysed data from the US Centers for Disease Control's Youth Risk Behavior Survey to find out whether legalisation of medical marijuana leads to increased drug use in teens.

The survey tracks a number of behaviours, including self-reported marijuana use. Rees and colleagues sifted through data for the years 1993-2009, looking at outcomes such as marijuana use at school, frequent marijuana use, and the use of other substances, including alcohol and cocaine.

The team found that while teen marijuana use has risen since 2005, the increase was not correlated in a statistically significant way with whether or not the state that teens resided in had legalised the drug. "There is anecdotal evidence that medical marijuana is finding its way into the hands of teenagers, but there's no statistical evidence that legalisation increases the probability of use," said Rees in an?online statement?from the University of Oregon.

A number of recent studies have added support to proponents' claims that cannabis and cannabis-based treatments are?safe and effective?for conditions ranging from rheumatoid arthritis to multiple sclerosis, but legalising medical marijuana has been a tough sell in US states this year. Ballot initiatives?have failed in 11 states?so far, and passed in just one. Seven more states are slated to decide what side of the fence they fall on later this year.

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Tuesday, June 19, 2012

15% of survey respondents pick weekend with iPhone over sex

Used electronics reseller Gazelle recently published the result of a survey of some 1,000 smartphone-toting customers. 65% picked iPhone as something they couldn't live without, compared to the 1% that said Facebook. 15% went so far as to say that they would sooner give up sex than go a full weekend without their iPhone.


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Saturday, June 16, 2012

Factbox: Changes in U.S. immigration policies under Obama

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Saturday, May 26, 2012

Rattlesnake bites kid near Lake Mary church

A child was bitten Friday by a rattlesnake in Lake Mary near Holy Cross Lutheran Church, according to Lake Mary police.

The unidentified 9-year-old had just arrived at the church with his mother at about 12:45 p.m. to pick up a sibling when he reached into a patch of grass and was bitten on a finger, said Officer Zach Hudson.

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Monday, May 21, 2012

Alleged perpetrator of mass beheadings in Mexico arrested

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