Human Body Systems Homeostasis Bell Ringer Digestion Six

Human Body Systems - Homeostasis

Bell Ringer: Digestion Six friends were talking about the digestive system. They said: Mina: I think the main function is to release energy from food. Manny: I think the main function is to help us breathe. Sasha: I think the main function is to break food down into molecules that can be absorbed by cells. Harriet: I think the main function is to break food down into small pieces to be used by the body. Todd: I think the main function is to carry nutrients to different parts of the body. Curtis: I think the main function is to store food until we need it.

Comparative Anatomy

Homeostasis What is it? Body’s way of maintaining an equilibrium through internal mechanisms

Ways Humans Maintain Homeostasis 1. Body Temperature 2. Response to stimuli 3. Glucose regulation 4. Toxin secretion 5. Consistent blood pressure 6. Balance p. H levels

How do humans maintain homeostasis? Body temperature? Sweating while running cools the body Higher metabolism creates more heat What is metabolism? Breakdown of molecules for energy

What body systems help maintain body temperature? Circulatory: blood vessels allow more blood to flow towards the skin, causing sweat to cool down or slow blood flow towards the skin to warm up Respiratory: exhaling warm air cools the body Musculoskeletal: muscle contraction creates heat to warm up the body

Homeostasis in humans Response to stimuli Pulling Pupil away after touching a hot surface constriction during a sunny day Create more red blood cells when a toxin is ingested or inhaled What body systems are interacting? Nervous Immune

Glucose Regulation Glucose Too needs to remain regulated for health much: insulin (a hormone) is released Too little: converts glycogen (energy storage molecule) in the blood into glucose Excretory

Toxin Excretion Carbon dioxide through breathing Urine Sweat Indigestible materials What body systems excrete toxins? Respiratory Digestive

Blood Pressure Regulation Brain signals the heart to speed up or slow down depending on if the blood pressure is too high or too low at body system regulates blood pressu Nervous Cardiovascular

p. H Balance If p. H becomes unbalanced, lungs push more or less carbon dioxide out of the body which raises or lowers the p. H High p. H = more basic Low p. H = more acidic What body system balances p. H? Respiratory

1. 2. Web. Quest: Human Body Systems Choose either digestive, respiratory, circulatory, excretory, immune, nervous, or musculoskeletal system Answer questions on worksheet