Titlebook: Human Reproduction and Developmental Biology; D. J. Begley,J. A. Firth,J. R. S. Hoult Textbook 1980Latest edition D. J. Begley, J. A. Firt

畏缩

D. J. Begley BSc, PhD,J. A. Firth MA, PhD,J. R. S. Hoult BA, PhD

食草

障碍物

难解

DENT

Implantation and Establishment of the Conceptus,f the embryo’s mitochondrial DNA is therefore maternal. This condition persists for the entire life span of the new individual. In addition other molecules of shorter life such as some RNA and proteins are derived from the egg. Thus much of the metabolic activity and initial behaviour of the zygote depends entirely on molecules of maternal origin.

sigmoid-colon

CANON

The Female Reproductive System,ed by menstrual bleeding. The human cycle, conventionally numbered from the first day of menstruation, has an average length of 28 days and is repeated until an egg is fertilised. Ovulation occurs at mid-cycle, usually day 14, and if fertilisation occurs implantation usually begin bout 7 days later.

Irksome

The Male Reproductive System,e testis. The formation of male gametes, spermatogenesis, within the seminiferous tubules is also continuous and their maturation proceeds as they move through the different regions of the testis and epididymis.

是贪求

Reproductive Failure and Wastage,that human reproduction is fallible and that conception does not automatically result in the birth of a live and healthy infant. The causes of failure and the inefficiencies of the human reproductive process are discussed in this chapter, with special emphasis on those developmental errors which give rise to abnormalities of the newborn.

Chromatic

Growth, Puberty and Ageing, first approach to the detailed biological analysis of growth. In this sense, growth is usually taken to exclude temporary fluctuations in otherwise stable dimensions due to accumulation of fat or water.