BIOL 1107 Chapter Notes - Chapter 38: Tight Junction, Nervous Tissue, Muscle Tissue
Document Summary
Aqueous solution that surrounds individual animal cells contains ions and molecules in particular concentrations to maintain osmotic balance and maintenance needs. Allows multicellular organisms to live in various conditions. Internal environment : fluid within organism that supplies all the needs of individual cells. Single-celled organisms exchange materials with fluid in external environment. Multicellularity allows major life functions to be divided among specialized groups of cells. Tissue : group of cells with similar structure and specialized function. Organ : integrates 2+ different tissues into structure that performs a particular function. Organ system : collection of organs with related functions that interact to carry out a major body function. Ex. eye, liver, stomach such as digestion. Ex. nervous system is the main regulatory system of the body (brain + spinal cord + peripheral nerves + sensory organs) Structure and integrity of tissue depend on. Structure and organization of cytoskeleton within the cell. Type and organization of the extracellular matrix surrounding the cell.
