CARDIOVASCULAR SYSTEM
What are the THREE main parts of the cardiovascular system?
Heart, blood vessels, blood
What are the main organs of the respiratory system?
Lungs, trachea, bronchi
What are the main organs of the digestive system?
Mouth, stomach, small intestine, large intestine
What are the main parts of the nervous system?
Brain, spinal cord, nerves
Which system controls all other systems?
Nervous system
What is the main job of the circulatory system?
Carries oxygen and nutrients / removes waste
What is the function of the respiratory system?
Brings in oxygen, removes carbon dioxide
What is the function of the digestive system?
Breaks down food & absorbs nutrients
What is the nervous system’s main function?
Controls thoughts, movement, sends signals
Which two systems work together to transport oxygen through your body?
Respiratory + Circulatory
Which system works directly with the circulatory system to get oxygen into the blood?
Respiratory system
Why do you start breathing faster when you exercise?
Muscles need more oxygen & produce more carbon dioxide
Where do nutrients enter the bloodstream?
After digestion, through the small intestine
Why do your hands shake when you’re scared or excited?
Adrenaline makes muscles react faster
Which two systems work together to get nutrients to the cells?
Digestive + Circulatory
Why do athletes have slower resting heart rates?
A stronger heart pumps more blood with each beat
Why does holding your breath feel uncomfortable?
Carbon dioxide builds up in your body
Why does your stomach growl when you’re hungry?
Stomach muscles contract to get ready for food
Why do you get “butterflies” in your stomach when nervous?
Blood flow shifts away from the stomach
Why does your heart beat faster when you’re scared?
Nervous system triggers fight-or-flight → adrenaline
Why do your hands and feet get cold first when you're cold?
Blood flow reduces to extremities to protect vital organs
Why does your nose run when it’s cold?
Blood vessels open to warm the air → causes extra mucus
Why does spicy food burn your tongue AND stomach?
Capsaicin triggers pain receptors
Why do you remember emotional moments better than normal ones?
Stronger memory pathways form during emotional events
A student sneezes, feels scared, their heart races, and they start breathing fast.
Name the THREE systems involved.
Nervous (fear), respiratory (sneeze/breathing), cardiovascular (heart rate)