how respiration takes place

Question 1

Breathing in is called….

Answer 1

inhalation or inspiration

Question 2

The muscles of quiet (unforced) inhalation are

Answer 2

Diaphragm

External intercostal muscles

Question 3

The diaphragm contracts and becomes flatter after receiving nerve impulses from

Answer 3

the phrenic nerves

Question 4

Contraction of the diaphragm is responsible for about what percentage of the air that enters the lungs during quiet breathing?

Answer 4

75%

Question 5

During breathing

Advanced pregnancy, obesity, confining clothing, or increased size of the stomach after eating a large meal can

Answer 5

impede descent of the diaphragm and may cause shortness of breath

Question 6

This has what effect

Contraction and flattening causes lung volume to expand, thus pulling the ribs upward and outward

Answer 6

increases lung volume

Question 7

Breathing out is called

Answer 7

exhalation or expiration

Question 8

During _______ inhalations the Sternocleidomastoid muscles elevated the sternum, the scalene muscles elevate the two uppermost ribs, and pectoralis minor muscles elevate the third through fifth ribs, thus increasing lungs size.

Answer 8

deep, labored

Question 9

The muscles of quiet (unforced) exhalation are

Answer 9

Diaphragm and external intercostal

Question 10

The body uses these muscles during what?

a) Internal intercostal
b) External oblique
c) Internal oblique
d) Transverse abdominis
e) Rectus abdominis

Answer 10

forced exhalation

Question 11

Lung expansion causes air molecules within the lungs to occupy a larger volume.
What does this do to the air pressure inside the lungs?

Answer 11

decrease

Question 12

When when lung volume decreases what happens to alveolar pressure?

This related to air to entering or exiting the lungs?

Answer 12

• Increases

- Exiting

Question 13

When lung volume increases what happens to alveolar pressure?

This related to air to entering or exiting the lungs?

Answer 13

• Decreases

- Entering

Question 14

At rest just before inhalation, the air pressure inside the lungs is _______

Answer 14

the same as the atmosphere

760 mm Hg at sea level

Question 15

As the diaphragm and external intercostal contract and the overall size of the thoracic cavity increases.

This causes the volume of the lungs to increase, but what happens to the alveolar pressure?

Answer 15

-Alveolar pressure decreases from 760 to 758 mm Hg

Question 16

When the diaphragm and external intercostal relax, lung elastic recoil causes the lung volume to decrease.

What happens to alveoli pressure?

Answer 16

-Alveolar pressure RISES from 758 to 762 mmg HG

Question 17

normal quiet Inhiation is an active or passive process?

Answer 17

active

Question 18

normal quiet Exhalation is an active or passive process?

Answer 18

Passive