Respiratory System Basics
What is the main organ of the respiratory system?
A) Heart
B) Lungs
C) Stomach
D) Brain
Answer: B) Lungs
What organ pumps blood throughout the body?
A) Brain
B) Heart
C) Lungs
D) Kidneys
Answer: B) Heart
When you exercise, what happens to your breathing?
A) It gets slower.
B) It gets faster.
C) It stops for a moment.
D) It stays the same.
Answer: B) It gets faster.
How many lungs do humans have?
A) One
B) Two
C) Three
D) Four
Answer: B) Two
What part of the brain controls breathing?
A) Cerebrum
B) Brainstem
C) Cerebellum
D) Hypothalamus
Answer: B) Brainstem
What tube carries air from your throat to your lungs?
A) Esophagus
B) Bronchi
C) Trachea
D) Diaphragm
Answer: C) Trachea
What are the tiny blood vessels that connect arteries to veins?
A) Capillaries
B) Arterioles
C) Alveoli
D) Veins
Answer: A) Capillaries
What happens to your heart rate when you run?
A) It decreases.
B) It increases.
C) It stops briefly.
D) It stays the same.
Answer: B) It increases.
What color is blood inside your body?
A) Blue
B) Green
C) Red
D) Purple
Answer: C) Red
What is the name of the fluid that surrounds the heart and reduces friction as it beats?
A) Pericardial fluid
B) Synovial fluid
C) Plasma
D) Lymph
Answer: A) Pericardial fluid
(Daily Double):
What tiny air sacs in your lungs exchange oxygen and carbon dioxide?
A) Bronchi
B) Capillaries
C) Alveoli
D) Arteries
Answer: C) Alveoli
What is the main function of red blood cells?
A) Fight infections
B) Carry oxygen
C) Produce energy
D) Regulate body temperature
Answer: B) Carry oxygen
Why does your face sometimes turn red when you exercise?
A) Your body needs more air.
B) Blood is flowing to your skin to release heat.
C) You are losing oxygen.
D) You are sweating.
Answer: B) Blood is flowing to your skin to release heat.
How many times does your heart beat in one minute, on average?
A) 20-40 times
B) 60-100 times
C) 120-140 times
D) 200+ times
Answer: B) 60-100 times
What is the name of the valve that prevents blood from flowing back into the left atrium from the left ventricle?
A) Pulmonary valve
B) Mitral valve
C) Aortic valve
D) Tricuspid valve
Answer: B) Mitral valve
What muscle below the lungs helps you breathe in and out?
A) Heart
B) Stomach
C) Ribcage
D) Diaphragm
Answer: D) Diaphragm
What are the two main types of blood circulation in the body?
A) Arterial and Venous
B) Pulmonary and Systemic
C) Oxygenated and Deoxygenated
D) Large and Small
Answer: B) Pulmonary and Systemic
How does oxygen travel from the lungs to the rest of the body?
A) It moves through the muscles.
B) It is absorbed by the skin.
C) It is carried by red blood cells in the blood.
D) It travels through nerves.
Answer: C) It is carried by red blood cells in the blood.
What happens to the diaphragm when you breathe in?
A) It contracts and moves down.
B) It relaxes and moves up.
C) It stays in place.
D) It vibrates.
Answer: A) It contracts and moves down.
How does carbon dioxide leave the bloodstream and enter the lungs?
A) It diffuses from blood into alveoli.
B) It travels through the nerves to the lungs.
C) It is pushed out by the diaphragm.
D) It binds to oxygen in the alveoli.
Answer: A) It diffuses from blood into alveoli.
What happens to the oxygen we breathe in?
A) It is absorbed by the stomach.
B) It enters the bloodstream and is carried to cells.
C) It is stored in the lungs for later use.
D) It leaves the body right away.
Answer: B) It enters the bloodstream and is carried to cells.
What is the name of the largest artery in the body?
A) Vena Cava
B) Aorta
C) Pulmonary Artery
D) Coronary Artery
Answer: B) Aorta
(Daily Double):
What gas do your cells produce that the blood carries back to the lungs?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
Answer: C) Carbon dioxide
How much air do you breathe in and out each day?
A) 1,000 liters
B) 5,000 liters
C) 11,000 liters
D) 50,000 liters
Answer: C) 11,000 liters
What is the approximate number of alveoli in an adult's lungs?
A) 10,000
B) 300,000
C) 30 million
D) 300 million
Answer: D) 300 million