Human physiology test ch. 12-14 (Multiple choice)

human-physiology-test-ch-12-14-multiple-choice

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Question 1 of 1

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if P(atm) + 0 mmHg and P(alv) = -2 mmHg, then

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Explanation

If alveolar pressure (Palv) is negative with respect to atmospheric pressure (Patm), the driving force for airflow inward(from the atmosphere into the lung)

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Transpulmonary pressure (Ptp) increase by 3 mmHg during normal inspiration. In subject A, 500 ml of air is inspired. In subject B, 250 ml of air is inspired for the same change in Ptp. Which is true?

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Explanation

For the same change in transpulmonary pressure, a less complaint (i.e., stiffer) lung will have a smaller change in lung volume.

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If alveolar ventilation is 4200 mL/min, respiratory frequency is 12 breaths per min, and tidal volume is 500 mL, what is the anatomical-dead-space ventilation?

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Explanation

Total minute ventilation is comprised of dead space plus alveolar ventilation. Minute ventilation is respiratory frequency (12 breaths per minute) multiplied by tidal volume (500 mL/breath) = 6000 mL/min. Subtract from that alveolar ventilation (4200 mL/min) and one gets 1800mL/min.

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Which of the following will increase alveolar Po2?

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Explanation

An increase in alveolar Po2 results from an increase in alveolar ventilation (supply of oxygen) relative to metabolic rate (consumption of oxygen)

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Which of the following will cause the largest increase in systemic arterial oxygen saturation in the blood?

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Explanation

The relationship between arterial Po2 and arterial oxygen saturation is described by the oxygen-hemoglobin dissociation curve. The greatest increase in oxygen saturation for the same change in Po2 occurs at the steepest part of the curve--a Po2 of between 40 and 60 mmHg.

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In the arterial blood with a Po2 of 60 mmHg, which of the following situations will result in the lowest blood oxygen saturation?

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Explanation

Increases blood temperature, decreases in blood pH, and increase in DPG shift the oxygen-hemoglobin curve downward, leading to a lower oxygen saturation at the same Po2.

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Hemantocrit is increased

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Explanation

Reduced oxygen delivery to the kidneys increases the secretion of erythropoietin, which stimulates bone marrow to increase production of erythrocytes.

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The principal site of erythrocyte production is

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Which of the following contains blood with the lowest oxygen content?

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Explanation

Blood in the right ventricle is relatively deoxygenated after returning from the tissues.

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If other factors are equal, which of the following vessels would have the lowest resistance?

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Explanation

Resistance decreases as the 4th power of an in crease in radius, and in direct proportion to a decrease in vessel length.

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Which of the following correctly ranks pressures during isovolumetric contraction ofa normal cardiac cycle

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Explanation

See figure 12.22 on page 380

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Consider as a whole, the body's capillaries have

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Explanation

The large total cross-sectional area capillaries results in very slow blood velocity.

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Which of the following would not result in tissue edema?

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Explanation

Increase colloid osmotic pressure would decrease filtration of fluid from capillaries into the tissues.

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Which statement comparing the systemic and pulmonary circuits is true?

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Explanation

Pressures are higher in the systemic circuits, but because the cardiovascular system is a closed loop, the flow must be the same in both.

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What is mainly responsible for the delay between the atrial and ventricular contractions?

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Explanation

The AV mode is the only conduction point between atria and ventricles, and the score propagation through it delays the beginning of ventricular contraction.

Human physiology test ch. 12-14 (Multiple choice)

Question 1 of 1

Time Left

if P(atm) + 0 mmHg and P(alv) = -2 mmHg, then

Select the correct answer(s).

(0/0)

Explanation

Transpulmonary pressure (Ptp) increase by 3 mmHg during normal inspiration. In subject A, 500 ml of air is inspired. In subject B, 250 ml of air is inspired for the same change in Ptp. Which is true?

Select the correct answer(s).

(0/0)

Explanation

If alveolar ventilation is 4200 mL/min, respiratory frequency is 12 breaths per min, and tidal volume is 500 mL, what is the anatomical-dead-space ventilation?

Select the correct answer(s).

(0/0)

Explanation

Which of the following will increase alveolar Po2?

Select the correct answer(s).

(0/0)

Explanation

Which of the following will cause the largest increase in systemic arterial oxygen saturation in the blood?

Select the correct answer(s).

(0/0)

Explanation

In the arterial blood with a Po2 of 60 mmHg, which of the following situations will result in the lowest blood oxygen saturation?

Select the correct answer(s).

(0/0)

Explanation

Hemantocrit is increased

Select the correct answer(s).

(0/0)

Explanation

The principal site of erythrocyte production is

Select the correct answer(s).

(0/0)

Which of the following contains blood with the lowest oxygen content?

Select the correct answer(s).

(0/0)

Explanation

If other factors are equal, which of the following vessels would have the lowest resistance?

Select the correct answer(s).

(0/0)

Explanation

Which of the following correctly ranks pressures during isovolumetric contraction ofa normal cardiac cycle

Select the correct answer(s).

(0/0)

Explanation

Consider as a whole, the body's capillaries have

Select the correct answer(s).

(0/0)

Explanation

Which of the following would not result in tissue edema?

Select the correct answer(s).

(0/0)

Explanation

Which statement comparing the systemic and pulmonary circuits is true?

Select the correct answer(s).

(0/0)

Explanation

What is mainly responsible for the delay between the atrial and ventricular contractions?

Select the correct answer(s).

(0/0)

Explanation

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