organization of the human body chapter 30.1

the levels of organization in the body include cells, tissues, organs and organ systems

a cell is a basic unit of structure and function in living things and individual cells in multicellular organisms tend to be specialized

tissues are a group of cells that perform a single function

there are different types of tissues

this kind of tissue lines the interior and exterior of body surfaces

this type of tissue provides support for the body and connects its parts

nerve impulses are transmitted throughout the body by this kind of tissue

movements of the body are possible because of this kind of tissue

organs are a group of different tissues that work together to perform a single function or several related functions

an organ system is a group of systems that perform closely related functions such as the brain and spinal cord are organs of the nervous system

homeostasis describes the relatively constant internal physical and chemical conditions that organisms maintain despite changes in internal and external environments

feedback inhibition or negative feedback is the process in which a stimulus produces a response that opposes the original stimulus

in the human body temperature is controlled through various feedback inhibition mechanism

the liver is one of the body's most important organs for homeostasis

the two roles of the liver in maintaining homeostasis relate to