make up a system, which provide organisms with an advantage for survival. Systems are the most complex organizations in your body; the progression is from individual cells to tissues to organs and finally systems. (Andrew Rader, 2012) Systems work alone and with other systems to allow your body to maintain homeostasis. Homeostasis is what regulates internal conditions so that they remain stable and constant.
What are Tissues?
Tissues are comprised of individual cells and are one of the main building blocks of an organism. All the cells in a tissue do the same job. There are four basic human tissues, connective tissue, muscle tissue, epithelial tissue and nervous tissue. In each of the types there are different kinds of tissue but they all do a similar job. Connective tissue is simply what
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This system is vital to ensure the survival of a species through the production of reproductive cells. Mammals reproduce sexually, with the female being fertilized by the male. The female reproductive system consists of to main parts, the uterus and the ovaries. (Figure 12) The uterus is where the development of the foetus takes place, where vaginal and uterine discharges are produced and where the sperm passes through to the fallopian tubes leading into the ovaries. The ovaries are where the female sex cells are produced. The male reproductive system is made up of 3 main external structure; the penis, scrotum and testicles. The penis is the male organ for sexual intercourse (Cleveland Clinic, 2011). The semen, which contains sperm, is expelled (ejaculated) through the penis. The scrotum is a sac of skin that hangs behind the penis. It contains the testicles as well as nerves and blood vessels. The scrotum acts as a temperature control for the testicles as they need to be at a slightly cooler