3.2 Respiratory System Flashcards
What is your respiratory system responsible for?
Is responsible for supplying your blood with oxygen and removing the carbon dioxide from your blood and returning it to the air outside your body.
Why does breathing occur?
Breathing occurs because of your rib and diaphragm muscles.
What happens when you inhale?
These muscles contract, pulling your ribs up, and your diaphragm down. This increases the size of your chest and lungs, pulling air into your lungs.
What happens when you exhale?
These muscles relax: your ribs go down and your diaphragm goes up. This decreases the size of your chest and lungs, forcing air out
What do cells need?
Your cells need oxygen to release energy from nutrients such as glucose. They also need to rid themselves of the carbon dioxide waste gas produced at the same time
What does the respiratory system draw?
The respiratory system draws oxygen-rich air into the lungs through a series of tube-like passageways called bronchi.
What is Bronchi?
Bronchi are lined with tough connective tissue to keep the walls from collapsing.
What does the bronchi do?
These bronchi narrow to bronchioles that end in about 600 000 000 tiny, air-filled sacs called alveoli.
What are Alveoli surrounded by?
The alveoli, like the capillaries that surround them, are made of specialized epithelial tissue
How many layers is the tissue?
This tissue is only one cell layer thick. This means that the distance between the air inside the alveoli and the blood inside the capillary is very short.
How long does it take for blood to travel up your lungs?
It takes only one second for the blood to travel through your lungs, picking up as much oxygen as it can hold and releasing its carbon dioxide waste
