Cartilage is a connective tissue with a large amount of the matrix and variable amounts of…

Connective tissues are made up of a matrix consisting of living cells and a non-living substance,…

Multicellular, complex animals have four primary types of tissue: epithelial, connective, muscle, and nervous. Recall…

A standing vertebrate animal can be divided by several planes. A sagittal plane divides the body into…

Figure 14.1  An arctic fox is a complex animal, well adapted to its environment. It…

Pregnancy begins with the fertilization of an egg and continues through to the birth of…

The ovarian and menstrual cycles are regulated by hormones of the hypothalamus, pituitary, and ovaries…

The human male and female reproductive cycles are controlled by the interaction of hormones from…

Gametogenesis, the production of sperm and eggs, involves the process of meiosis. During meiosis, two…

As in all animals, the adaptations for reproduction in humans are complex. They involve specialized…