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1. Describe the transport of oxygen from an alveolus to a respiring cell and the movement of carbon dioxide from a cell to the air in an alveolus include the directions of diffusion for oxygen and carbon dioxide in an alveolus and in the blood plasma near respiring cell.

2. Compare blood flow through an artery and a vein and relate the flow characteristics to the structures of these blood vessels

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Lelia Lubowitz
Lelia LubowitzLv2
28 Sep 2019
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Related questions

1. Which of the following is the correct sequence of bloodflow?

a. heart --> atery --> arteriole --> capillary -->vein --> venule --> heart

b. heart --> vein --> venule --> capillary -->arteriole --> artery --> heart

c. heart --> artery --> arteriole --> capillary -->venule --> vein --> heart

d. heart --> artery --> venule --> capillary -->arteriole --> vein --> heart

e. heart--> artery --> capillary --> arteriole -->venule --> vein --> heart

2. What are the functions of the elastic fibers that are foundin the walls of ateries? (there may be more than one answer)

Select one or more:

a. they allow the artery to stretch and then recoil back to itsoriginal shape as blood is forcegully pumped from the heart intothe arteries

b. they allow arteries to lengthen as the volume of blood in thearteries increase

c. they help maintain a steady blood pressure during thedifferent phases of heart contraction

d. they smooth out the walls of the arteries to preventturbulent blood flow

3. Which of the following are functions of the lymphatic system?(there may be more than one answer)

Select one or more:

a. help fight infections and cancer

b. allows excess interstitial fluid (fluid found between thecells in your tissues) to get dumped back into your blood

c. brings large molecules from fat digestion into thebloodstream so that they can be processed and stored

d. all of the above are functions of the lymphatic system

4. Which of the following blood vessels bring newly oxygenatedblood from the blood vessels in the lungs back to the heart so thatthe heart can pump it to the rest of the body?

Select one:

a. aorta

b. inferior vena cava

c. pulmonary vein

d. pulmonary artery

5. Which of the following mechanisms help blood fight gravity sothat, for instance, it can return from blood vessels in your feetback into your heart? (there may be more than one answer)

Select one or more:

a. breathing allows the pressure in your chest to decrease andallow blood to flow up towards your heart

b. as you walk, the skeletal muscles in your legs contract andsqueeze the veins; since veins have valves, blood flows up anddoesn't backflow back down

c. the force of blood flowing out of the heart and into thearteries pushes all of the blood along, causing blood to return tothe heart

d. precapillary sphincters open to allow blood to flow backtowards the heart

6. The tricuspid and bicuspid/mitral valves prevent backflow ofblood from the atria into the ventricles.

Select one:

True

False

7. The following sequence represents the correct order of bloodflow through the heart:

inferior and superior vena cava --> right atrium --> rightventricle --> pulmonary artery --> lungs --> pulmonaryvein --> left atrium --> left ventricle --> aorta

Select one:

True

False

8. Capillaries are as wide as one red blood cell.

Select one:

True

False

9. The purpose of the coronary arteries is to bring oxygenatedblood to the walls of the heart so that the muscles in the heartwalls can contract.

Select one:

True

False

10. Vasodilation refers to the narrowing of blood vessels.

Select one:

True

False

How much carbon dioxide and oxygen from/for respiration are inthe bloodstream at any one time? (mass per litre of blood orsimilar)

And would there be much more aside from the blood in tissue,e.g. muscle, brain, etc.

So far the figures I have are as follows (please double checkfor me, I dont have a clue)

O? molecules per red blood cell: 1 billion. Red blood cells permicro litre of blood in males: 4.7 to 6.1 million. Molecules permole: 6 x 10^23. Therefore moles of O2 per litre of blood: approx0.01 (correct?) This seems quite low, since an inhalation istypically 0.5L and about a quarter of the oxygen is absorbed(oxygen by volume, 5% of the air) (1 thousandth of a mole of oxygenabsorbed per inhalation?)

1. Which of the following structures is intended to maximize the surface area available for gas exchange?

a. Thin membranes lining respiratory organs such as gills and lungs.

b. Multiple infoldings of respiratory surfaces, such as lamellae in gills.

c. Inhaled fresh air is mixed with old air from the previous breathing cycle.

d. Blood circulates in counter current direction to water flow in gills.

-------------------------------------

2. The affinity of hemoglobin for oxygen changes with pH. What is affecting the pH of the blood?

a. The blood changes its pH based on the amount of carbon dioxide dissolved.

b. The blood changes its pH based on the amount of oxygen dissolved.

c. The pH of the blood is adjusted centrally in the hypothalamus.

d. The pH of the blood is constant and never changes.

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