Homeostasis in the Multicelled Organisms pp. 907-910

If cells have to be so small to maintain homeostasis, then how do complicated organisms like plants and animals survive?

HOMEOSTASIS Homeostasis in the human body is maintaining a stable internal environment Cells of the same type work together to do a specific job maintain homeostasis EX. Osmosis in an individual cell versus your kidneys to remove excess water from your blood to make urine

Levels of Organization Cells  tissues organs  organ systems

BODY TISSUES

Muscle: contract in coordination upon stimulation (skeletal, cardiac, smooth)

Nervous: receive and transmit information and signals (made of cells called neurons)

Epithelial: line surfaces of bodies, cavities, canals

Connective: cells surrounded by extra- cellular, non-living tissue called a matrix (bone, cartilage, tendons, blood)

ORGANS Tissues working together

BODY CAVITIES Spinal, cranial, thoracic, diaphragm, abdominal, pelvic Know the locations in your body

ORGAN SYSTEMS Skeletal: protection and support Muscular: support and movement Skeletal: protection and support

Circulatory: transport of gases, nutrients, waste, and chemicals throughout body Respiratory: Gas exchange

Endocrine: controls body function via chemical messengers. Nervous: regulates body via impulses

Digestive: breakdown and absorption of food Excretory: removal of liquid and solid wastes

Reproductive: production of sex cells to make offspring Immune: Fights pathogens and disease