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Organ systems and Homeostasis

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1 Organ systems and Homeostasis
Ch.13 section 1 Organ systems and Homeostasis

2 Our body 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

3 Cells 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

4 Tissues Muscles tissue Nervous tissue Connective 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

5 Organs and Organ Systems
Integumentary Skeletal Muscular Circulatory Respiratory Digestive Excretory Immune Reproductive Nervous Endocrine

6 Integumentary 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.

7 Skeletal Bones and other connective tissues
Supports the body and gives it structure Protects body’s organs Produce bloods cells Connective tissues attaches bones together

8 Muscular Move the body by pulling on the skeleton
Involuntary muscles work by themselves Muscles and bones: musculoskeletal system Cells – fibers – muscle groups

9 Circulatory 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

10 Respiratory 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.

11 Digestive 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

12 Excretory 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

13 Immune 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)

14 reproductive Organs that produce sex cells
Sex cells carry DNA – information Organs can also produce chemicals that regulate the physical development

15 Nervous 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

16 Endocrine 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

17 Homeostasis (hoh-mee-oh-stay-sis)
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.

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