The second portion of the chapter deals with muscular fatigue, including the most likely causes of fatigue to various categories of activity, and muscle soreness. Methods of assessing muscular strength are presented in the third section of the chapter.
The sex chromosomes are the X chromosome and the Y chromosome. Sex Chromosomes. In human sexual reproduction, two distinct gametes fuse to form a zygote. Gametes are reproductive cells produced by a type of cell division called meiosis. Gametes are also called sex cells. They contain only one set of chromosomes and are said to be haploid. The male gamete, called the spermatozoan, is relatively motile and usually has a flagellum. The female gamete, called the ovum, is nonmotile and relatively large in comparison to the male gamete.
This is a diploid zygote. The cells from each parent that combine to form the zygote are called gametes. In humans, the male gamete is called sperm, and the female gamete is called an egg.When the gametes join they form a cell called a zygote. Human sperm and eggs contain 23 chromosomes.he type of cell division that produces gametes with half the normal chromosome number is called meiosis. It is used to produce cells for repair and asexual reproduction.