MCAT- Biology

Columnar Epithelium is composed of long, thin, column shaped cells.

The follicular phase begins when the uterine lining of the previous cycle begins to shed. 1. As Estrogen and Progesterone fall in response to the death of the corpus luteum, GnRH is secreted in response. 2. GnRH secretion leads to the rise of FSH and LH. 3. FSH and LH work together to cause the follicles in the ovary to grow (Mostly FSH though) 4. As the follicles grow, they release estrogen, which negatively inhibits the hypothalamus and causes a drop in GnRH, which slows the increase of FSH and LH. 5. The estrogen that has been released gets to work on re-thickening the endometrium.

23 homologous pairs.

Eukaryotic Chromosomes are large pieces of DNA that are formed from the wrapping of DNA around histones and the packing of those histones into a linear structure.