Human Physiology: Lecture 8 (True Or False)

Front 1

True Or False

Quiet exhalation is accomplished by contracting inspiratory muscles.

Back 1

False

Front 2

True Or False

After quiet exhale, lung pressure exceeds atmospheric pressure.

Back 2

False

Front 3

True Or False

Most of the CO2 from cellular respiration/oxidative phosphorylation is excreted via the lungs as a gas.

70% of metabolic CO2 becomes bicarbonate, an important weak acid used to buffer and maintain normal blood pH.

Back 3

False

Front 4

True Or False

Quiet expiration requires contraction of the diaphragm, external intercostals, and scalene muscles.

Back 4

False

Front 5

True Or False

Hyperventilation is an example of positive feedback.

Back 5

False

Front 6

True Or False

During normal inspiration, volume of the thoracic cavity increases due to contraction of the diaphragm, scalene muscles, and sternomastoids.

Back 6

False

Front 7

True Or False

During hyperventilation, active expiration decreases thoracic volume.

Back 7

True

Front 8

True Or False

O2 diffuses from a higher partial pressure in the tissue capillaries to a lower partial pressure in the tissue spaces.

Back 8

True

Front 9

True Or False

Expiration of the lungs can only occur when the inspiratory muscles are relaxed.

Back 9

True

Front 10

True Or False

External intercostal muscles are innervated by the phrenic nerve.

Diaphragm = phrenic nerve; external intercostals = intercostals nerve. The cell bodies for both nerves are located in the spinal cord.

Back 10

False

Front 11

True Or False

Asthma is the result of over-active parasympathetic stimulation.

Back 11

True