Presentation on theme: " Each part of the body has a specific function, or job. The levels of organization in the human body consists of: › Cells › Tissues › Organs › Organ."— Presentation transcript:
Each part of the body has a specific function, or job. The levels of organization in the human body consists of: › Cells › Tissues › Organs › Organ systems
Cell theory: a cell is the basic unit of structure and function of a living thing Structure: › Membrane › Cytoplasm › Nucleus Functions: cellular respiration, grow, reproduce, excrete waste
Muscles tissue › Can contract (shorten) to move the body Nervous tissue › Directs and controls › Carries electrical messages Connective tissue › Provides support and connects: › bone and fat Epithelial tissue › Skin › lining of digestive system
Skin, hair, and nails make up your body’s covering Create a barrier Regulate your body temp Remove waste – perspire Works with nervous system to give info about your environm.
Bones and other connective tissues Supports the body and gives it structure Protects body’s organs Produce bloods cells Connective tissues attaches bones together
Move the body by pulling on the skeleton Involuntary muscles work by themselves Muscles and bones: musculoskeletal system Cells – fibers – muscle groups
Transportation network – carries food and oxygen Collects waste Transports blood Powered by pumping of blood: heart Away: arteries To: veins Capillaries: smallest – connect the arteries and veins- reach every cell
Lungs : takes in oxygen and disposes of carbon dioxide Air moves into the lung then to the capillaries Oxygen crosses into the blood Lung expands due to the actions diaphragm.
Digestion: breakdown of food into small molecules the body can use Liver produces bile and pancreas makes enzymes which help break down the food Water is removed in large intestine
Body makes excess water and waste Excretory system removes these waste products Kidneys has nephrons which filters blood Urine flows from kidney to urinary bladder
Protects the body from disease-causing bacteria and viruses(pathogens) White blood cells attack and destroy viruses or make antibodies (proteins) The immune system remembers the past pathogens and destroys them quicker the next time. (immunity)
Organs that produce sex cells Sex cells carry DNA – information Organs can also produce chemicals that regulate the physical development
Takes info from envir and body – processes this info and commands the body to respond Some times, you control the brain, in other times, the brain decides for you (involuntary) Brain + spinal cord + nerve cells
Helps regulate the activities of the organs by releasing hormones (chemicals that change the activity in cells) Collection of glands (tissues that produce and release hormones) Brain signals how much hormones to produce
Process by which an organism’s internal environment is kept stable in spite of changes in the external environment Warm blooded… 37 °C – even when it’s cold or hot Sweating… or shivering Stress : reaction of your body to potentially threatening, challenging, or disturbing events.- body produces adrenaline to carry more oxygen to body cells.