Lecture 2: respiratory pump Flashcards

1
Q

Diaphram

A
Dome shaped
when relaxed: pushes into thorax
Contraction: flattens
Expands lower rib cage by lifting up on the ribs by attachment to the costal arch
PRIMARY INSPIRATORY MUSCLE
INNERVATED by PHRENIC NERVE
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

External intercostal muscles are oriented to?

A

lift ribs (during inspiration)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Internal intercostal muscles are oriented to?

A

depress the ribs (during expiration)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

T/f: Raising ribs decreases circumference of the chest

A

FALSE: it increases the circumference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Abdominals

A

muscles of expiration (primary); used for forceful exhale; active contraction pushed diaphragm into thorax passively

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Volume of thorax is increased by?

A

Flattening of diaphragm and lifting of ribs , pressure of chamber decreases and air is sucked in

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Pump

A

respiratory muscle; expands chamber volume by creating negative pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Parietal and visceral pleura are separated by?

A

thin layer of plural fluid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

pleural pressure

A

negative pressure in this fluid created by opposite forces of the chest wall/ tendency to spring outward, pulling the lung out at its rest position and the lung wants to collapse

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Pnemothorax

A

hole made in the chest, causing lung to collapse and the chest wall to expand (each going in respective rest position); lungs don’t move; no ventilation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Alveolar Pressure

A

P(subA) Pressure difference between atmosphere and alveoli; at rest it is equal to atmospheric pressure;lung expansion makes it more negative

How well did you know this?
1
Not at all
2
3
4
5
Perfectly