Respiratory System
how many lungs are there?
2
What are the three main components of the circulatory system?
Blood, Blood Vessels and the heart
What do the intercostal muscles do?
Contract and relax to enlarge and shrink the chest cavity during breathing
The bigger the animal, the slower the resting heart rate
True
About how big is your heart?
About the size of your fist
What is the purpose of the respiratory system?
To supply oxygen to the body and get rid of carbon dioxide and other wastes
What are the four components of blood?
Plasma, red blood cells, white blood cells and platelets
What does the epiglottis do?
Blocks the trachea during swallowing to prevent food from entering the lungs
Only 20% of your waste is removed through your lungs just by breathing
False, about 70% of your waste is removed by breathing
what is an independent variable?
The variable that you are purposely changing within an experiment
When you inhale, which muscles contract?
The diaphragm and the intercostal muscles
Which blood vessel has valves and why?
Veins, to stop the back flow of blood when blood is returning to the heart
What do valves do?
Open and close to stop the back flow of blood
Science is the best subject
True
Which component of blood makes up the most of its volume?
plasma
What happens once oxygen reaches the alveolus
Gas exchange occurs - oxygen enters the blood as carbon dioxide exits
What are two features of arteries?
Thick wall, withstand high pressure, carry blood away from the heart
What does the diaphragm do?
Contracts and relaxes to enlarge and shrink the chest cavity
Your heart briefly stops when you sneeze
False, although it doesn't stop, it can change your rhythm
What does cardiac mean?
It refers to the heart
How does carbon dioxide leave the lungs?
It travels up through the bronchi, through the trachea and out through the mouth or nasal cavity
Where does the pulmonary vein receive blood from?
the lungs
What does the heart do?
The heart pumps blood around the body to supply cells with oxygen and rid them of waste
Miss Luna's favourite subject is Human Biology
True
What is the alveoli covered by?
A network of capillaries