martes, 9 de octubre de 2007

PARTS OF THE CELLS

ANIMAL CELL ANATOMY
-Cell membrane : the thin layer of protein and fat that surrounds the cell.
-Centrosome: a small body located near the nucleus - it has a dense center and radiating tubules. The centrosomes is where microtubules are made.
-Cytoplasm: the jellylike material outside the cell nucleus in which the organelles are located.
-Golgi body : a flattened, layered, sac-like organelle that looks like a stack of pancakes and is located near the nucleus.
-Lysosome : round organelles surrounded by a membrane and containing digestive enzymes.
-Mitochondrion: spherical to rod-shaped organelles with a double membrane.
-Nuclear membrane: the membrane that surrounds the nucleus.
-Nucleolus: an organelle within the nucleus - it is where ribosomal RNA is produced.
-Nucleus: spherical body containing many organelles, including the nucleolus.
-Ribosome: small organelles composed of RNA-rich cytoplasmic granules that are sites of protein synthesis.
-Rough endoplasmic reticulum: a vast system of interconnected, membranous, infolded and convoluted sacks that are located in the cell's cytoplasm.
-Smooth endoplasmic reticulum: a vast system of interconnected, membranous, infolded and convoluted tubes that are located in the cell's cytoplasm.
-Vacuole: fluid-filled, membrane-surrounded cavities inside a cell.

TIPES OF CELLS



ANIMAL CELLS






VEGETAL CELLS







lunes, 8 de octubre de 2007

TISSUES OF THE HUMAN BODY













TIPES OF TISSUES








<- EPITHELIUM IMAGE


Epithelium - Tissues composed of layers of cells that cover organ surfaces such as surface of the skin and inner lining of digestive tract: the tissues that serve for protection, secretion, and absorption.


CONNECTIVE TISSUE IMAGE







Connective tissue - As the name suggests, connective tissue holds everything together. Connective tissue is characterized by the separation of the cells by an inorganic material, which is called extracellular matrix. Bone and blood are connective tissues.


MUSCLE TISSUE IMAGE





Muscle tissue - Muscle cells contain contractile filaments that move past each other and change the size of the cell. Muscle tissue also is separated into three distinct categories: visceral or smooth muscle, which is found in the inner linings of organs; skeletal muscle, which is found attached to bone in order for mobility to take place; and cardiac muscle which is found in the heart.



































martes, 2 de octubre de 2007

UNIT 1

HUMAN BODY (APARATUS AND SISTEMS)








CIRCULATION SISTEM







APARATUS DIGESTIVE