Animal Tissue and Anatomy

Endothelium is a type of epithelium that lines the interior surface of blood vessels and lymphatic vessels, forming an interface between circulating blood or lymph in the lumen and the rest of the vessel wall. It is a thin layer of simple squamous cells called endothelial cells.

Chloragogen cells in annelids function as a liver in vertebrates. These cells store glycogen and neutralise toxins and are yellowish in colour.

The structures which are similar in their morphology, anatomy, genetics and embryology, but are dissimilar in their functions are called homologous organs.

Acoustic communication is essential for the frog's survival. 

A nephric tubule leads from each nephrostome through the septum and into the following segment. This tubule then leads to the main body fluid filtering organ, the nephridium or metanephridium, which removes metabolic waste from the coelomic fluid and expels it through pores called nephridiopores. These are found maximum in the clitellar region as this region is formed by merging two or three segments.

These hairs, called cilia, move back and forth to help move particles out of our body. We find ciliated epithelial tissue in our respiratory tract and in the fallopian tubes of women. Ciliated epithelium contains goblet cells, which secrete mucous. It is present in the nasal chamber.

A tendon serves to move the bone or structure. A ligament is a fibrous connective tissue which attaches bone to bone and usually serves to hold structures together and keep them stable.

null

null

Ovary in females and testis in males are the primary sex organs in humans.

Robert Hooke assigned the term 'cell'  to the compartments which he saw under a magnifying device.

null

null

null

The tapetum secretes a peri-tapetal membrane with Ubisch bodies. It is first secreted with the clusters of globules and then with the exine-like spines on the top of clusters.