The structural classification of joints is based on the composition of the binding material and the presence or absence of a joint cavity. true or false

True

Explanation:

A joint is a point of connection between two or more bones in the body, linking the skeletal system into a whole functional system. Joints can be classified structurally depending on the composition of the binding material and the presence or absence of a cavity at the joint.

Classification of joints, according to the material the joint is composed of, and the absence of joint cavity, include:

1. Fibrous Joints: The bones in this type of joints are held together by a dense, tough connective tissue. This fibrous tissue is rich in collagen fibers. There is absence of cavity in this joint.

2. Cartilaginous Joints: Bones in this joint are connected by hyaline cartilage or fibrocartilage. They have no joint cavity.

3. Synovial Joints: These joints have a cavity called the synovial cavity which is filled with synovial fluid.

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation:

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