Skeletal System
How many bones does an adult human have?
206
What type of muscle is attached to bones?
Skeletal muscle
What organ pumps blood around the body?
Heart
What muscle helps you breathe?
Diaphragm
Which organ controls the nervous system?
Brain
What is the longest bone in the human body?
Femur
What happens to a muscle when it contracts?
It shortens
Which blood vessels carry blood away from the heart?
Arteries
In which structures does gas exchange occur?
Alveoli
What is a stimulus?
A change in the environment that can be detected.
What is the main function of cartilage in joints?
Reduces friction and absorbs shock
Which muscle works opposite the biceps?
Triceps
What is the function of red blood cells?
Carry oxegyn.
What gas do humans breathe out?
Carbon dioxide
Which sense uses olfactory receptors?
Smell
Name three functions of the skeletal system.
Support, protection, movement, blood cell production, mineral storage
Why do muscles work in antagonistic pairs?
Muscles can only pull, not push.
Which chamber of the heart pumps oxygenated blood to the body?
Left ventricle
Why do alveoli have a large surface area?
To increase gas exchange.
Why do you stop noticing a smell after several minutes?
Sensory adaptation.
A person breaks a rib. Why can this injury affect breathing?
Ribs protect the lungs and move during breathing.
Why is warming up important before exercise?
Increases blood flow, flexibility, and reduces injury risk.
Trace the path of blood through the heart and lungs.
Right Atrium → Right Ventricle → Lungs → Left Atrium → Left Ventricle → Body
What happens to breathing rate during exercise and why?
It increases to supply more oxygen and remove more carbon dioxide.
A student touches a hot pan and pulls away immediately. What is this called?
A reflex action.