Answer: Blood, Blood Vessels, Heart
Explanation: The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic). The system is responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells.
-Ultraviolet (UV) exposure – The sun is the most well-known source of UV radiation, but UV rays also come from tanning beds and other artificial sources.
-Genetics – Some risk factors of skin cancer can be inherited through our DNA.
-Immunosuppression – Some conditions, like AIDS, and certain medications, such as those provided after organ transplants, can suppress the body’s immune system and might contribute to the development of skin cancer.
-Radiation exposure – In addition to UV, there are other forms of radiation that may adversely affect the skin cells, such as X-rays or therapeutic radiation.
-Toxic sunscreens -- Most sunscreens block the absorption of Vitamin D with toxic chemicals that seep through the skin and into the bloodstream and all throughout your body. Using these toxic sunscreens could actually cause cancer. Some toxic ingredients that are in these kinds of sunscreens: oxybenzone. benzene, parabens, homosalate, octinoxate, and octocrylene
Caucasians are more at risk for skin cancer because they have less melanin produced in their skin. Lighter skin tones produce less melanin and are more prone to damaged DNA particulate from UV radiation.
Answer:
The correct answer is e. all of the above.
Explanation:
Nurse cells are also called sertoli cells and are located in the seminiferous tubules in the testes. They provide nourishment to the growing sperms by providing nutrients from surrounding cells.
During the development of of sperms they become genetically different from other cells so nurse cells form blood testes barrier to protect them from immune cells.
Nurse cells concentrate the testosterone in seminiferous tubules which is necessary for proper development of sperms. They also secrete inhibin which stop FSH secretion from anterior pituitary therefore regulate the spermatogenesis.
Explanation:
Keep your face to the sunshine and you cannot see a shadow.
. Yesterday is not ours to recover, but tomorrow is ours to win or lose.”
