Biology Homework With Citation – Essay Example

Kalaivani 08-Oct-2009 Epithelial tissue is most likely to cause over 90% of all cancers.Two reasons why epithelial tissues cause most cancers are one,epithelial cells covers and lines the outside of the body and two, epithelial cells cover the inside too.They cover all the body organs – for example, the organs of the digestive system and they line the body cavities, such as the inside of the chest cavity and the abdominal cavity.(
2. Exclusively breastfed babies are at the greatest risk of rickets because although breastfeeding is considered the ideal form of nourishment for infants — breast milk doesnt have high enough concentrations of vitamin D . . ..( body makes Vitamin D when exposed to sunlight.Wearing sunscreen while outside is a situation in which Vitamin D supplements are required, although exposed to enough sunlight.(
3. The pituitary gland, for instance, secretes growth hormone (GH), also called somatotropin, which stimulates activity in the epiphyseal plates. This hormone is the main regulator of height. Since the epiphyseal plates are completely ossified, growth hormone therapy won’t help.(
4. Daughter Homozygous recessive Emma Heterozygous Gus Heterozygous (
5. a. Astronauts face long periods of immobility, which can cause loss of bone mass and hence osteoporosis. (
b. Osteoporosis is characterized by a reduction in bone mineral density (BMD). BMD in the total body, hip, lumbar spine, and radius is weakly to moderately correlated to body weight, fat mass, and lean body mass in adolescent, perimenopausal, and elderly women, possibly as the result of stress on the skeleton from the mechanical loading of body weight alone. . Other explanations include increased hormonal circulation in obese women and greater conversion of adrenal androgens to estrogens linked to greater mass of adipose tissue. (
“Types of cells and cancers” n.d. Web. 08 October 2009
“AAP Recommends Doubling Kids Daily Vitamin D” n.d. Web. 08 October 2009
“Bone Development and Structure” n.d. Web. 08 October 2009
“The Genetics of PKU” n.d. Web. 08 October 2009
“What’s the link between astronauts and osteoporosis” n.d. Web. 08 October 2009
“Putting body weight and osteoporosis into perspective” n.d. Web. 08 October 2009
“Rickets: What It Is and How Its Treated” n.d. Web. 08 October 2009