List of articles in "Anatomical Structure" category - Page 435

The pupil is a hole located in the center of the iris of the eye that allows light to enter the retina. It appears black because light rays entering the […]

There are two types of glands in animals: exocrine and endocrine. These are then divided into further subtypes. The glands are responsible for secreting substances into and around the body […]

The lymphatic system is part of the circulatory system comprising a network of conduits called lymphatic vessels that carry a clear fluid called lymph (from Latin lympha water goddess) directionally […]

The trachea or windpipe is a tube that connects the pharynx and larynx to the lungs allowing the passage of air and so is present in all air-breathing animals with […]

The duodenum /ˌduːəˈdinəm/ is the first section of the small intestine in most higher vertebrates including mammals reptiles and birds. In fish the divisions of the small intestine are not […]

The human gastrointestinal tract (GI tract) is an organ system responsible for consuming and digesting foodstuffs absorbing nutrients and expelling waste.The tract is commonly defined as the stomach and intestine […]

The mucous membranes (or mucosae or mucosas; singular mucosa) are linings of mostly endodermal origin covered in epithelium which are involved in absorption and secretion. They line cavities that are […]

Human teeth are the teeth (small calcified hard whitish structures) found in the human mouth. They function in mechanically breaking down items of food by cutting and crushing them in […]

The testicle (from Latin testiculus diminutive of testis meaning witness of virility plural testes) is the male gonad in animals. Like the ovaries to which they are homologous testes are […]

The placenta is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake waste elimination and gas exchange via the mother’s blood supply. Placentas are […]