Chapter 4: TISSUES AND MEMBRANES Outline of Notes I. Introduction. A. General: Cells are highly specialized and interdependent on one another. Groups of similar cells performing similar functions are called Tissues The study of tissues is called Histology. Organs are made of tissues. A detailed understanding of tissues will greatly help your understanding of organs and organ systems later in this course. Tissues are classified into 4 main types: Epithelial‚ Connective‚ Muscular
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Layers of the skin The skin is an ever-changing organ that contains many specialized cells and structures. The skin functions as a protective barrier that interfaces with a sometimes-hostile environment. It is also very involved in maintaining the proper temperature for the body to function well. It gathers sensory information from the environment‚ and plays an active role in the immune system protecting us from disease. Understanding how the skin can function in these many ways starts with understanding
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Classification of Tissues Introduction Cells are the smallest units of life. In complex organisms‚ cells group together with one another based on similar structure and function to form tissues .Tissues provide the numerous functions of organs necessary to maintain biological life. This lab exercise seeks to introduce the various tissues found in the human body and to familiarize you with their composition and function. The study of tissues is called histology ‚ and is important to the understanding
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Epithelial Tissue covers body surfaces (epi‚ on + thelium‚ surface). Epithelial tissue consists of cells attached to one another to form an uninterrupted layer of cells that separates the underlying tissues from the outside world. The body’s epithelium not only covers its obvious surfaces (such as the epidermis of the skin and the linings of respiratory‚ urinary‚ and digestive tracts) but also extends into all of the complex invaginations which form lungs‚ kidneys‚ sweat glands‚ digestive glands
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ONION EPIDERMIS INTRODUCTION An eukaryote is an organism whose cells contain a nucleus and other structures (organelles) enclosed within membranes. Plant cells are eukaryotic cells that differ in several key aspects from the cells of other eukaryotic organisms. Their distinctive features include: A large central vacuole a water-filled volume enclosed by a membrane known as the tonoplast which maintains the cell’s turgor (provide structural support) and controls movement of molecules between the cytosol
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Task 1- tissues Tissues are groups of similar cells which have a similar structure and function. All of these cells work together to complete various tasks. There are four different types of tissues in the human body that I am going to give examples of. These include the epithelial tissue‚ connective tissue‚ collagenous tissue and the nerve tissue. The first time of tissue is the epithelium tissue which has the function of helping to protect the body. There are four main types of epithelium tissues;
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SKIN I. INTRODUCTION Skin‚ outer body covering of an animal. The term skin is commonly used to describe the body covering of any animal but technically refers only to the body covering of vertebrates (animals that have a backbone). The skin has the same basic structure in all vertebrates‚ including fish‚ reptiles‚ birds‚ and humans and other mammals. This article focuses primarily on human skin. The skin is essential to a person’s survival. It forms a barrier that helps prevent harmful microorganisms
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BIO - PROJECT PLANT TISSUES Two Major Categories of Plant Tissues 1. Meristematic Tissue. A. Apical Meristems B. Lateral Meristems 2. Permanent Tissue A. Dermal (Surface Tissue) B. Fundamental Tissue (Ground Tissue) C. Vascular Tissue MERISTEMATIC TISSUE Composed of immature cells and are regions of active cell division. small‚ thin walls and rich in cytoplasm. Found in the growing tips of the roots and stem. A. Apical Meristems * Responsible for increase in length of
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SKIN • Largest and heaviest organ of the body; accounts for about 15% of the total body weight • Also called as cutaneous membrane • Skin contains two layers‚ the epidermis and the dermis. • The hypodermis is the layer underneath the skin. FUNCTIONS • Skin is a protective covering that prevents harmful substances from entering the body. • It helps regulate body temperature and water loss. • It houses sensory receptors and contains immune system cells. • It synthesizes chemicals and excretes
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QUILONA‚ KLARISSE JANE A. BSP-1B Animal Tissues 1. Epithelial Epithelial tissue is made of closely-packed cells arranged in flat sheets. Epithelia form the surface of the skin‚ line the various cavities and tubes of the body‚ and cover the internal organs. Subsets of Epithelia Epithelia that form the interface between the internal and external environments. Skin as well as the lining of the mouth and nasal cavity. These are derived from ectoderm. Inner lining of the GI tract‚ lungs‚ urinary
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