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This reviews the vocab found in the 2nd half of the Structure & Function Unit

Protein a molecule made of amino acids that does "work" for your cells
receptor molecule a molecule that receives a message (hormone or neurotransmitter) based on matching chemical shape
enzymes (biological catalyst) a type of protein that speeds up chemical reactions (digestion and synthesis).
hormone a protein made by a gland that travels through the blood to send a message when it matches a cell's receptor
tissue a group of "like" cells working together
organ a group of "like" tissues working together (ex. heart, lungs, kidneys)
organ system a group of "like" organs working together to accomplish a life process for an organism
organism a collection of organ systems that work together to complete the life processes of an organism.
homeostasis the balanced state that organisms need for health and survival
metabolism how quickly an organism does all of its life processes.
feedback mechanism a constant loop where one "thing" turns on or off another to maintain an overall balance in an organism (ex. the insulin/glucagon loop that maintains blood sugar levels)
stimuli something that requires a response
immunity when an organism can no longer be harmed by a pathogen
pathogen an organism that harms another organism (bacteria, virus, fungus and parasite)
antigen anything that causes an immune response because the body thinks it will cause harm (allergy, transplanted organ, etc.)
antibody a white blood cell that disables an antigen so that it can no longer hurt the organism
white blood cell cells that fight the foreign invaders (pathogens/antigens)
vaccine a dead or weakened form of a virus that is injected to create an immune response and ultimately create memory cells that make an organism immune.
allergy an antigen that enters the body and needlessly creates an immune response and unwanted swelling and symptoms
HIV/AIDS a virus that enters the body, attacks and ultimately disables the immune system so that it can no longer fight foreign invaders.
Organ rejection When your immune system fights and tries to destroy a transplanted organ because it recognizes it as a foreign invader.
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