Mechanics of Elastic Recoil (EXAM 1)

Question 1

Elastic Recoil

Answer 1

Resisting change when contracted
amount of elastic recoil depends on volume of air inhaled (equal and opposite)
Requires no muscle contraction
like a spring that is pulled and springs back (the springing back portion is the elastic recoil)

Question 2

During Inhalation…

Answer 2

1. Ribcage raised against gravity
2. Diaphragm pushes against abdominal viscera (=& opp)
3. alveolar sacs inflated against ST

all 3 wants to go back (elastic recoil) (Potential energy)

Question 3

During Passive Exhalation…

Answer 3

(one primary muscles of inhalation relax)
1. Rib cage pulled down by gravity
2. Abdominal viscera pushes up on diaphragm (=&opp)
3. alveolar sacs recoil

leads to elastic recoil aka muscleless exhalation
whatever happens in inhalation causes the recoil

Question 4

Relaxation pressure

Answer 4

Alveolar pressure generated by elastic recoil
i.e. alveolar pressure that results from when muscles relax and elastic recoil takes place

Question 5

Speech exhalation

Answer 5

Combination of passive and active forces where muscles of inhalation relax and elastic recoil/relaxation pressure takes place plus exhalation muscle contraction to maintain cmH20 of speech!