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
epithelial, connective, nervous and muscle
epithelial, connective and nervous
epithelial, connective and muscle
this kind of tissue lines the interior and exterior of body surfaces
epithelial
connective
nervous
muscle
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
the liver quickly converts ammonia to urea and converts many dangerous substances into compounds that can be removed from the body safely
the liver regulates the level of glucose and prevents it from rising too much
both of the above
