breathing

Question 1

Where do the lungs expand into during inhalation?

Answer 1

pleural cavity

Question 2

What cause air to be sucked into the trachea ?

Answer 2

the NEGATIVE PRESSURE

Question 3

What kind of process is quite expiration and why?

Answer 3

PASSIVE-doesnt require muscle contraction

-depends on the ELASTIC RECOIL of the tissue of the lungs ans in the rib cage

Question 4

What kind of process is deep/forced expiration?

Answer 4

-ACTIVE

Question 5

What assists the process of deep/forced expiration?

Answer 5

muscles of the abdomen wall that squeeze the abdominal organs against the diaphragm and pull the lower ribs down

Question 6

What nerve innervates the diaphragm to contract during inhalation?

Answer 6

PHRENIC nerve from the spinal cord segments C3,4 AND 5=thoracic cavity increases

Question 7

What happens when the volume of the thoracic cavity increases?

Answer 7

intrapleural pressure reduces

Question 8

What is the diaphragm attached to?

Answer 8

• costal margin
• XIPHOID PROCESS
• ends of the floating ribs 11 and 12
• posteriorly to the lumbar vertebrae

Question 9

What organs are covered by the diaphragm, pleura and lungs?

Answer 9

High abdominal organs such as the liver-this is possible due to the dome of the diaphragm bulging high inside the rib cage