Structure and Function of Epithelia Epithelia are layers of the cell that cover internal or external surfaces. Epithelia line all passageways that communicate with the outside world. For example, the digestive, reproductive, respiratory, and urinary tracks. There are four main functions of epithelial tissue. Provide physical protection Control permeability Provide sensation Produce specialized secretions There are various specialized types of epithelia.
Part 6 1. Collect a prepared slide of euglena 2. Observe under a microscope and label all visible parts. Analysis Questions: 1. The type of cell tissues on my hand is epithelial tissue.
Identify the four fundamental types of tissues and give their functions. Epithelial tissue covers the body/lining for all internal and external body tissues. And composes glands-tightly together with no space between. Functions: protection, sensation, diffusion, secretion, absorption and excretion. Connective tissue: Connects and supports the structures of the body, providing structural support and binding organs together.
The nervous system is defined by the presence of a special type of cell, called the neuron. Neurons send signals with rapid precision to other cells with special structures that allow them to accomplish this task. Sensory neurons carry impulses or electrochemical signals to the interneurons of the brain. The interneurons interpret these impulses while the motor neurons carry
Nails provide a protective covering on the dorsal surface of the distal part of a finger or toe. They can be useful when you need to pick up small objects or scratch an itch. Glands are also included in the integumentary system. There are two different types, sweat glands and oil glands. Sweat glands are distributed over the entire skin surface except the nipples and parts of the external genitalia, there are up to 3 million sweat glands on everyone.
(Murdoch) The fetal side of the placenta is very smooth and flat. The middle layer is the chorioallantonic membrane, which is made up of the chorion and the allantois. The allantois gives rise to part of the chorion during placental development, to be described later. (Murdoch) This layer contains the chorionic villi. The Chorionic villi are the looping capillaries of the fetal venules and arterioles, it is here were all the gas, nutrient, and waste exchange occurs between the maternal and fetal blood.
EPITHELIUM By: Khalid Al-Kraida Anatomy Department College of Medicine KSU INTRODUCTION TO THE CONCEPT OF EPITHELIUM FEATURES OF EPITHELIUM: Epithelium lines the surfaces of the body and is mainly located on the borders between the external and internal environments. Epithelium also lines all the internal body spaces that have a connection with the external environment at some stage. Epithelium is a tissue composed of cells; tightly-bound to each other, with little intercellular substance. There are specializations of the cell membranes of epithelial cells that play roles in maintaining the integrity of the tissue. Epithelium is an avascular tissue and has no integral (direct) blood supply.
Please refer to the figure below to understand all the three layers. Each layer has it own function and own importance in maintaining the integrity of skin and thereby the whole body structure. So lets, study each part in detail. 1. Epidermis: Epidermis is the topmost layer or rather the visible part of the skin that is composed of stratified squamous epithelial cells.
Neurons receive signals from either the external or internal environment, and transmit them in the form of electrical impulses to other neurons, muscles or glands. There are three types of neurons: sensory neurons, motor neurons, and interneurons. Within the nervous system, where the tissues can be found there are four main nerve groups that link back from the body to the brain through the spinal cord. There are two main systems the peripheral nervous system, which has sensory nerves through out the body with it connects to the central nervous system the spinal cord and brain. Sensory nerves send messages to the glands and the muscles, telling them what to do.
White matter is a component of the central nervous system, in the brain and superficial spinal cord, and consists mostly of glial cells and myelinated axons that transmit signals from one region of the cerebrum to another and between the cerebrum and lower brain centers. Gray matter is a major component of the central nervous system, consisting of neuronal cell bodies, neuropil (dendrites and myelinated as well as unmyelinated axons), glial cells (astroglia and oligodendrocytes) and capillaries. Grey matter is