human body systems Flashcards
what is the purpose of the skeletal system
- supports the body
- gives the body its shape
- protects organs in the body (heart, lungs)
what is the purpose of the digestive system
- breaks down food into simpler substances
- absorbs digested food into bloodstream
- removes undigested food out of the body
what is the purpose of the circulatory system
- carries digested food, water and oxygen in the blood via the blood vessels to all parts of the body
- carries carbon dioxide away from different parts if the body via the blood vessels to the heart
name the organs in the digestive system
mouth, gullet, stomach, small intestines and large intestines
how long does food stay in the stomach
3-5 hours
where does digestion complete
small intestines
explain what happens inside the lungs
carbon dioxide in the blood passes through the walls of the blood vessels and enters the lungs. At the same time, oxygen passes through the blood vessels and enters the bloodstream.
why is there a change in his heart rate when exercising
when he exercises, his heart rate increases so that it can transport more oxygen and digested food to the muscles to produce more energy.
where does gaseous exchange happen (fish)
gills
where are stomata usually found
underside of leaf
state the difference between the flow of blood in fish and in human.
human has double circulation but fish has single circulation
why is there a change in breathing rate while exercising
when he exercise, his breathing rate increases to take in more oxygen to absorb into the bloodstream. Therefore, blood with more oxygen is transported to the muscles to produce more energy.
where does water enter in the fish
mouth
