Tissues, organs & systems

• Tissue - cells working together to carry out a function
• Atom —> molecule —> cell —>tissue —> organ —> organ system —> organism
• An organ is a group of tissues working together to carry out a function
• An organ system is a group of organs
• an organism is a group of organ systems
• The nervous system controls the body's responses to stimuli.

  
• glands produce saliva that contains the enzyme amylase to digest carbohydrates
• The substrate starch is broken down by the enzyme amylase producing glucose
• The stomachcontains hydrochloric acid to kill bacteria and secrates protease enzyme to digest proteins
• The protein is broken down by the enzyme protease producing amino acids
• The small intestine, where the absorption of small molecules into the blood occurs, contains all three enzyme types by the pancreas
• The substrate are broken down by the enzyme into glycerol and fatty acids