Biology human tissues

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human tissues, types, characteristics...
Irene  Casado Mercahnte
Flashcards by Irene Casado Mercahnte, updated more than 1 year ago
Irene  Casado Mercahnte
Created by Irene Casado Mercahnte over 8 years ago
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HUMAN TISSUES
Epithelial tissue One/ more layers of cells. No spaces between them. Covers external surface (Skin)... + line cavities (stomach) + Glands.
1. Characteristics Cells FIRMLY ATTACHED to each other. If no, liquids would drip out. *Cells readily divide to make more cells. This helps this tissue recover after any sort of abrasions occur. *There are no blood vessels within it. *Nucleus can be seen easier
2. Functions Protection: As a barrier between the world and our body. Secretion: when our bodies need to release material, like hormones into the blood...this tissue produces and releases them Absorption: Epithelial tissue absorbs what we need when we eat.
Muscle tissue composed of elongated cells, the muscle fibres which contract in response to stimuli.
1.Types 1.Skeletal muscles: muscles of the locomotor system. 2.Cardiac muscle. Heart 3.smooth muscle: muscles of the walls of some organs.
2. Characteristics The muscle fibres are elongated, cylindrical and striated (arranged in parallel). The nuclei of the muscle fibres are elongated and found along the sides of the fibres.
Nerve tissue 1.neurons: cells capable of transmitting electrical impulses + control activitie of the organism 2:neuroglia cells which assist, protect and provide nutrients to the neurons.
1. Caracteristics It has the nucleus at the centre
Connective tissue It´s composed of cells separated by an intercellular substance called the matrix.
1.Characteristics *most diverse *Found throughout the body *2 main components: cells and extracellular matrix –fibres (mainly collagen) and a viscous fluid. *variety of physical structures: tendons, ligaments, cartilage, bones, adipose tissue, blood and lymphatic tissue.
2.Types conjunctive tissue, cartilaginous tissue, adipose tissue, bone tissue and blood tissue.
2.1 CONJUNTIVE joins and links the other tissues to each other
2.2 CARTILAGINOUS TISSUE Forms part of the skeleton and provides support to the soft parts of the body.
2.3BONE TISSUE Forms part of the skeleton, provides support to the organism and protects the vital organs.
2.4 ADIPOSE TISSUE makes up the organism’s greatest energy reserve (lipids). Provides thermal insulation (it is found under the skin). It also protects some internal organs.
2.5 BLOOD TISSUE liquid matrix is called plasma. Suspended in the plasma are the blood cells: red blood cells or erythrocytes, white blood cells and platelets.
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