Digestive System
What is the main job of the digestive system?
Break down food and absorb nutrients.
What happens in the alveoli that helps your body get the oxygen it needs?
Oxygen passes from the alveoli into tiny blood vessels (capillaries), and carbon dioxide moves from the blood into the alveoli to be breathed out.
How many chambers are in the human heart, and what are they called?
Four chambers – the right atrium, right ventricle, left atrium, and left ventricle.
What is the difference between a ligament and a tendon?
Ligaments connect bones to other bones; tendons connect muscles to bones.
These two body parts never stop growing.
Ears and nose.
What organ removes water from waste before it leaves your body?
Large intestine
What muscle helps you breathe in and out?
Diaphragm
What is the main job of veins in the circulatory system?
To carry blood back to the heart.
What type of muscle is found in the walls of organs like the stomach and intestines?
Smooth muscle
What type of joint is found in your knees and elbows?
Hinge joint
Where does most digestion happen?
Small intestine
Why does your breathing rate increase when you exercise?
Because your muscles need more oxygen and need to get rid of more carbon dioxide, so your lungs work faster to meet this demand.
Where does the aorta carry blood immediately after it leaves the heart?
To the arteries that branch off to supply the upper and lower parts of the body.
What are the three main types of muscles in the body?
Smooth, skeletal, and cardiac.
What are 2 of the purposes of cartilage in the human body?
Cushion bones, help joints move, protect bones from damage.
What is peristalsis, and why is it important in digestion?
Peristalsis is the wave-like muscle movement that pushes food through the digestive system, especially through the esophagus and intestines.
What tube connects your throat to your lungs and carries air to the lungs?
The trachea.
What is the job of valves in the heart?
They keep blood flowing in one direction and prevent it from going backward.
Why are bones considered living organs?
Because they have blood vessels, produce blood cells, and can grow and repair.
This part of your blood helps stop bleeding by forming clots.
Platelets
How does the structure of the small intestine help it absorb more nutrients?
It has folds and tiny finger-like structures called villi that increase the surface area for absorption.
What role does the epiglottis play in the respiratory system?
It covers the trachea when you swallow so food doesn’t enter your airway and lungs.
Why is the left ventricle the thickest chamber of the heart?
Because it must pump oxygen-rich blood to the entire body, requiring more force.
What two bones are connected by the LCL (lateral collateral ligament)?
The femur and the fibula.
This organ can regrow itself even after parts are removed.
Liver