Post on 20-Jan-2016
BODY SYSTEMS
BELL RINGER What system sends messages in the
form of electrical signals?
CH 37 BODY ORGANIZATION Objectives:
Identify levels of structural organization within the human body
Analyze four kinds of body tissue List the bodies major organs Evaluate the importance of endothermy
in maintaining homeostasis.
ORGANIZATION Four levels of organization
Cells Tissues Organs
Organ Systems
TISSUE Tissue-group of cells that work together
to perform a specific function.
4 Types of Tissues Epithelial
Connective Nervous Muscle
TISSUE Epithelial-lines most body surfaces and
protects other tissue from damage and dehydration.
Nervous-consists of nerve cells and carry information throughout the body.
Connective-support, protect, and insulate the body
Muscle-enables the movement of body structure by muscle conratcion.
Example: The function of the spongy tissue in the lung is to take in oxygen and release carbon dioxide.
ORGAN Organ-collection of tissues that carry on
a specialized function in the body.
Example: the function of the lung is to take oxygen from the air and deliver it to the blood and take carbon dioxide from the blood and deliver it to the air.
STEM CELLS
STEM CELLS Undifferentiated cells that give rise to all
of the cell types in the body.
Immortal and divide indefinitely
Stem cells come from embryos
Why is stem cell research controversial?
ORGAN SYSTEM A group of organs that work together to
carry out major activities or processes
ORGAN SYSTEMS
BODY CAVITIES Human body contains four large fluid
filled spaces to house organs Thoracic Cranial
Abdominal Spinal
BODY CAVITIES