Latest Basics News
Animal Primary Tissues
Multicellular, complex animals have four primary types of tissue: epithelial, connective, muscle,…
Animal Body Planes and Cavities
A standing vertebrate animal can be divided by several planes. A sagittal plane divides…
The Animal Body: Basic Form and Function
Figure 14.1 An arctic fox is a complex animal, well adapted to…
The Ovarian Cycle and the Menstrual Cycle
The ovarian and menstrual cycles are regulated by hormones of the hypothalamus,…
Hormonal Control of Reproduction
The human male and female reproductive cycles are controlled by the interaction…
Gametogenesis (Spermatogenesis and Oogenesis)
Gametogenesis, the production of sperm and eggs, involves the process of meiosis.…
Development and Organogenesis
The process by which an organism develops from a single-celled zygote to…
