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Human Body
human body systems and organs
Term | Definition |
---|---|
circulatory system | transports materials around the body |
capillaries | tiny blood vessels of the circulatory system that help with gas exchange and nutrient absorption |
respiratory system | exchanges gases between the body and environment; helps with breathing |
alveoli | small air sacks in the lungs that help with gas exchange |
gas exchange | oxygen and carbon dioxide cross between the alveoli of the respiratory system and capillaries of the circulatory system |
cellular respiration | glucose + oxygen --> ATP + water + carbon dioxide (how cells make cellular energy - ATP) |
breathing | inhaling oxygen and exhaling carbon dioxide |
levels of organization | cells -> tissues -> organs -> organ systems -> organism |
excretory system | removes wastes from the body |
kidney | organs of the excretory system that filter wastes from the blood |
muscular system | allows the body to move |
nervous system | controls the body's actions and allows it to respond to stimuli in the environment |
digestive system | breaks down food into usable nutrients |
homeostasis | maintaining a stable internal state or environemtn |
circulatory and respiratory systems | work together to perform gas exchange - gases cross between the alveoli and capillaries |
circulatory and digestive systems | work together to absorb nutrients from food - nutrients are absorbed into the bloodstream in the small intestine |
circulatory and excretory systems | work together to remove wastes from the blood - the kidneys filter wastes out of the blood |
process of digestion | food is eaten -> broken down into nutrients -> atoms are rearranged -> energy is released |
examples of homeostasis | sweating to cool your body when you exercise, breathing faster to bring in more oxygen for cells to use to make energy |
stimuli | an internal or external change that causes a response |
arteries | carry blood away from the heart |
veins | carry blood toward or into the heart |
small intestine | contains villi and absorbs nutrients that cross into the blood stream |
absorption of nutrients | nutrients are absorbed by the small intestine of the digestive system and cross into the capillaries of the circulatory system |