Question

1. Which of the following pertains to what happens when the diaphragm, external intercostal, scalene, pectoralis minor, serratus anterior and sternocleidomastoid muscles contract?

A. This occurs during forced inhalation. The sum of Tidal volume and inspiratory reserve cvolume of air inspired.

B. This occurs during foced inhalation. Tidal volume measeures the total volume of air inspired.

C. This occurs during foced exhalation. ERV measures the total volume of air expired.

D. This occurs during forced exhalation. VC measures the volume of air forcefully expired.

2. Normal healthy people breath due to______________.

A. A hypercapnic drive

B. A hypocapnic drive

C. A hypoxic drive

3. Breathing 100% oxygen will?

A. Significantly increase oxyhemoglobin saturation

B. Increase pO2 and the rate of oxygen unlodaing at the tissues

C. Cause a right shift in the oxygen-hemoglbin dissociation curve

4. Low blood levels of 02 augment chemoreceptor sensitvity to pCO2. How would low p02 effect respiratory rate?

A. It would increase Respiratoy Rate

B. It would decrease Repsiratoy Rate

5.All of the folloiwng play a role in increasing the oxygen unloading at tissue in someone with iron deficiency anemia Except:

A. Respriatory acidosis

B. An icnrease in 2-3 DPG

C. An increase in deoxyhemoglobin

D. The affinity of 2-4 DPG for hemoglobin.

Answer 1

No. 1.

when the diaphragm, external intercostal, scalene, pectoralis minor, serratus anterior, and sternocleidomastoid muscle contraction occur during forced inhalation. The sum of Tidal volume and inspiratory reserve volume of air inspired.

Answer - A. This occurs during forced inhalation. The sum of Tidal volume and inspiratory reserve volume of air inspired.

Breathing muscles and accessory muscles are used when there is a forced inspiration occur. In this case, The person inspired more air than tidal volume(The volume of air that enters and comes out during normal inspiration and expiration).

The excess air enters the lung during inspiration called inspiratory reserve volume (IRV)

IRV + TV = IC

No. 2.

Normal healthy people breathe due to A hypoxic drive.

Answer - C. A hypoxic drive

It is the drive initiated by low oxygen.

No. 3.

Breathing 100% oxygen will Increase pO2 and the rate of oxygen unloading at the tissues

Answer - B. Increase pO2 and the rate of oxygen unloading at the tissues.

High pressure or Concentrated oxygen can be very dangerous, it can cause oxygen toxicity(Due to Incrses PO2).

No. 4.

Low blood levels of o2 augment chemoreceptor sensitivity to pCO2. How would low p02 affect the respiratory rate?

Answer - A. It would increase Respiratory Rate.