Respiratory System 2Ms. Eramchuk

Review of last class: https://www.youtube.com/watch?v=

DCVIEMNPe1E

JIGSAW External Respiration Internal Respiration Cellular Respiration

In your groups, explore the assigned topic and summarize it in 1-2 sentences! Be prepared to explain the topic to fellow classmates

VIDEO!!! https://www.youtube.com/watch?v=

qM1A4O3urGE

Ignore the numbers (partial pressures, etc.) and focus on where the oxygen and carbon dioxide are travelling.

Fill in…

External Respiration Exchange of gases

(oxygen and carbon dioxide) in the lung – between alveoli (external) and pulmonary capillaries of the lung

External Respiration After inhalation, amount of oxygen in

alveoli is higher than blood, so oxygen dissolves in moist membrane and diffuses into blood

Carbon dioxide is brought to lungs and diffuses into alveoli

Internal Respiration Gas exchange (oxygen and carbon

dioxide) between blood and tissue cells in the body

Internal Respiration Movement of oxygen and carbon dioxide

between body cells and blood. Both diffuse through the intercellular fluid (from high to low conc.)

Cellular Respiration Cells need

oxygen to break down glucose and store its energy in molecules of ATP (adenosine triphosphate)

Energy in glucose cannot be used by cells until it is stored as ATP

Breathing Put your hand on your diaphragm and

breathe deeply. What is happening??

Breathing Inhalation (ACTIVE PHASE) –

sometimes called inspiration Ribs pulled up and out DIAPHRAGM pulled downwards Chest cavity larger – pressure inside

reduced Air rushes in Lungs expand

Breathing Exhalation (PASSIVE PHASE)

Diaphragm relaxes and moves up Rib muscles relax; chest cavity drops Chest cavity becomes SMALLER Pressure on lungs GREATER, air pushed

outward

https://www.youtube.com/watch?v=NSEzg6TBheY

Kahoot! Review

The Process of Breathing Please order the 4 stages of gas

exchange found in the envelopes at the front of the room

Individual, or groups of 2-3 is fine!

The Process of Breathing Gas Exchange: The 4 Stages

1) Breathing 2) External Respiration – oxygen and carbon

dioxide exchange between air and lungs 3) Internal Respiration – Oxygen and carbon

dioxide exchange between blood in capillaries and body cells

4) Oxygen and carbon dioxide transport between lungs and other body parts

LUNG IN A BOTTLE

Using only the supplies provided and your knowledge of the respiratory system, create a model which can illustrate the mechanics of breathing.

LUNG IN A BOTTLE https://www.youtube.com/watch?

v=S1zvN0HlG-c

ENTRANCE SLIP Please write down 3 facts that you know

about the respiratory system from the past 2 classes!

Oxygen Transport Oxygen is carried by hemoglobin in red

blood cells

HEMOGLOBIN: iron containing protein Oxygen-rich blood is bright red because of

OXYHEMOGLOBIN (oxygen + hemoglobin)

Blood low in oxygen is dark red or dull purple

Oxygen Transport https://www.youtube.com/watch?v=

WXOBJEXxNEo

Breathing – Controlled by the BRAIN! Breathing is an INVOLUNTARY

PROCESS controlled by the RESPIRATORY CENTRE (MEDULLA OBLONGATA) in the brain.

Chemoreceptors• Controlled by respiratory centre in the

brain (MEDULLA OBLONGATA)• Sensory structures in blood vessels sense

oxygen and carbon dioxide levels

• Based on the previous demo (with universal indicator), how might chemorecepters detect these levels? (TPS)

Chemoreceptors Higher CO2 levels in blood is the

stimulant that the respiratory center responds in order to signal the respiratory muscles to breathe

Chemoreceptors are responsible for detecting decrease in blood pH by CO2

Chemoreceptors

During heavy exercise, LACTIC ACID is produced by muscle cells; this increases the acidity in the blood and stimulates the respiratory centre to increase the rate of breathing

https://www.youtube.com/watch?v=F0OBkR00OZE