Question 1

One feature that amphibians and humans have in common is

Accepted Answer

A)  the number of heart chambers.
B)  the type of gas exchange tissues.
C)  a complete separation of circuits for circulation.
D)  the number of circuits for circulation.
E)  a low blood pressure in the systemic circuit.

Question 2

Breathing is usually regulated by

Accepted Answer

A)  erythropoietin levels in the blood.
B)  the concentration of red blood cells.
C)  hemoglobin levels in the blood.
D)  CO₂ and O₂ concentration and pH-level sensors.
E)  the lungs and the larynx.

Question 3

The meshwork that forms the fabric of a blood clot is

Accepted Answer

A)  chymotrypsin.
B)  fibrin.
C)  thrombin.
D)  prothrombin.
E)  collagen.

Question 4

Use the following information to answer the next few questions.
A paramedic arrives at a middle-aged man's home. The man is complaining of chest pain and shortness of breath. Upon examination of his medicine cabinet, the paramedic finds prescription bottles of statins and aspirin.
-Which ailment is the man most likely suffering from?

Accepted Answer

A)  Sickle cell disease.
B)  Altitude sickness.
C)  Thrombocytopenia.
D)  Cardiovascular disease.
E)  Hemophilia.

Question 5

During a prolonged dive, mammals such as the Weddell seal do all of the following except

Accepted Answer

A)  derive ATP from fermentation.
B)  route blood to major organs.
C)  decrease O₂ consumption rate.
D)  increase blood supply to muscles.
E)  decrease heart rate.

Question 6

The exhalation of air from human lungs is driven by

Accepted Answer

A)  a decrease in the volume of the thoracic cavity.
B)  a decrease in the residual volume of the lungs.
C)  the contraction of the diaphragm.
D)  the closure of the epiglottis.
E)  the expansion of the rib cage.

Question 7

The plasma proteins in humans

Accepted Answer

A)  maintain the blood's osmotic pressure.
B)  transport water-soluble lipids.
C)  carry out gas exchange.
D)  undergo aerobic metabolism.
E)  transport oxygen.

Question 8

Pulse is a direct measure of

Accepted Answer

A)  blood pressure.
B)  stroke volume.
C)  cardiac output.
D)  heart rate.
E)  breathing rate.

Question 9

After completing a race, a runner's heart rate begins to decelerate. Which of the following is responsible for this?

Accepted Answer

A)  adrenaline
B)  sympathetic nervous system
C)  parasympathetic nervous system
D)  epinephrine
E)  norepinephrine

Question 10

Damage to the sinoatrial node in humans

Accepted Answer

A)  is a major contributor to heart attacks.
B)  would block conductance between the bundle branches and the Purkinje fibers.
C)  would have a negative effect on peripheral resistance.
D)  would disrupt the rate and timing of cardiac muscle contractions.
E)  would have a direct effect on blood pressure monitors in the aorta.

Question 11

The circulatory system of bony fishes, rays, and sharks is similar to

Accepted Answer

A)  that of birds, with a four-chambered heart.
B)  the portal systems of mammals, where two capillary beds occur sequentially, without passage of blood through a pumping chamber.
C)  that of reptiles, with one pumping chamber driving blood flow to a gas-exchange organ, and a different pumping chamber driving blood to the rest of the circulation.
D)  that of sponges, in which gas exchange in all cells occurs directly with the external environment.
E)  that of humans, in which there are four pumping chambers to drive blood flow.

Question 12

If a molecule of CO₂ released into the blood in your left toe is exhaled from your nose, it must pass through all of the following except

Accepted Answer

A)  the pulmonary vein.
B)  an alveolus.
C)  the trachea.
D)  the right atrium.
E)  the right ventricle.

Question 13

Heart rate will increase in the presence of increased

Accepted Answer

A)  low-density lipoproteins.
B)  immunoglobulins.
C)  erythropoietin.
D)  epinephrine.
E)  platelets.

Question 14

What will be the long-term effect of blocking the lymphatic vessels associated with a capillary bed?

Accepted Answer

A)  more fluid entering the venous capillaries
B)  an increase in the blood pressure in the capillary bed
C)  the accumulation of more fluid in the interstitial areas
D)  fewer proteins leaking out of the blood to enter the interstitial fluid
E)  the area of the blockage becoming abnormally small

Question 15

An atmospheric scientist has created a mixture of air consisting of 15% oxygen and PO₂ of 75 mm Hg. The overall air pressure is

Accepted Answer

A)  500 mm Hg.
B)  5 mm Hg.
C)  50 mm Hg.
D)  0.5 mm Hg.
E)  5000 mm Hg.

Question 16

Which of the following develops the greatest pressure on the blood in the mammalian aorta?

Accepted Answer

A)  systole of the left atrium
B)  diastole of the right ventricle
C)  systole of the left ventricle
D)  diastole of the right atrium
E)  diastole of the left atrium

Question 17

An increased concentration of nitric oxide within a vascular bed is associated with

Accepted Answer

A)  vasoconstriction.
B)  vasodilation.
C)  narrowing of the arteries.
D)  a reduction in blood flow in that region.
E)  a decreased amount of blood in the capillaries of that vascular bed.

Question 18

When the air in a testing chamber is specially mixed so that its oxygen content is 10% and its overall air pressure is 400 mm Hg, then PO₂ is

Accepted Answer

A)  400 mm Hg.
B)  82 mm Hg.
C)  40 mm Hg.
D)  21 mm Hg.
E)  4 mm Hg.

Question 19

If the delay in impulse from the atrioventricular node to the ventricles is reduced, this would result in

Accepted Answer

A)  an increase in diastolic pressure.
B)  the incomplete emptying of atrial blood into the ventricles.
C)  the backflow of blood through the sinoatrial valve.
D)  an increase in cardiac output.
E)  a heart murmur.

Question 20

A person with a residual respiratory volume of 750 mL, a tidal volume of 500 mL, and a total lung capacity of 4500 mL would have a vital capacity of

Accepted Answer

A)  1250 mL.
B)  3750 mL.
C)  5000 mL.
D)  4000 mL.
E)  3250 mL.

Exam 42: Circulation and Gas Exchange

If the delay in impulse from the atrioventricular node to the ventricles is reduced, this would result in

Correct Answer
verified

Breathing is usually regulated by

Correct Answer
verified

An atmospheric scientist has created a mixture of air consisting of 15% oxygen and PO₂ of 75 mm Hg. The overall air pressure is

Correct Answer
verified

The plasma proteins in humans

Correct Answer
verified

Heart rate will increase in the presence of increased

Correct Answer
verified

An increased concentration of nitric oxide within a vascular bed is associated with

Correct Answer
verified

Damage to the sinoatrial node in humans

Correct Answer
verified

The meshwork that forms the fabric of a blood clot is

Correct Answer
verified

What will be the long-term effect of blocking the lymphatic vessels associated with a capillary bed?

Correct Answer
verified

One feature that amphibians and humans have in common is

Correct Answer
verified

The exhalation of air from human lungs is driven by

Correct Answer
verified

Correct Answer
verified

During a prolonged dive, mammals such as the Weddell seal do all of the following except

Correct Answer
verified

Pulse is a direct measure of

Correct Answer
verified

Which of the following develops the greatest pressure on the blood in the mammalian aorta?

Correct Answer
verified

A person with a residual respiratory volume of 750 mL, a tidal volume of 500 mL, and a total lung capacity of 4500 mL would have a vital capacity of

Correct Answer
verified

The circulatory system of bony fishes, rays, and sharks is similar to

Correct Answer
verified

If a molecule of CO₂ released into the blood in your left toe is exhaled from your nose, it must pass through all of the following except

Correct Answer
verified

When the air in a testing chamber is specially mixed so that its oxygen content is 10% and its overall air pressure is 400 mm Hg, then PO₂ is

Correct Answer
verified

After completing a race, a runner's heart rate begins to decelerate. Which of the following is responsible for this?

Correct Answer
verified

Exam 42: Circulation and Gas Exchange

If the delay in impulse from the atrioventricular node to the ventricles is reduced, this would result in

Correct AnswerverifiedShow Answer

Breathing is usually regulated by

Correct AnswerverifiedShow Answer

An atmospheric scientist has created a mixture of air consisting of 15% oxygen and PO₂ of 75 mm Hg. The overall air pressure is

Correct AnswerverifiedShow Answer

The plasma proteins in humans

Correct AnswerverifiedShow Answer

Heart rate will increase in the presence of increased

Correct AnswerverifiedShow Answer

An increased concentration of nitric oxide within a vascular bed is associated with

Correct AnswerverifiedShow Answer

Damage to the sinoatrial node in humans

Correct AnswerverifiedShow Answer

The meshwork that forms the fabric of a blood clot is

Correct AnswerverifiedShow Answer

What will be the long-term effect of blocking the lymphatic vessels associated with a capillary bed?

Correct AnswerverifiedShow Answer

One feature that amphibians and humans have in common is

Correct AnswerverifiedShow Answer

The exhalation of air from human lungs is driven by

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

During a prolonged dive, mammals such as the Weddell seal do all of the following except

Correct AnswerverifiedShow Answer

Pulse is a direct measure of

Correct AnswerverifiedShow Answer

Which of the following develops the greatest pressure on the blood in the mammalian aorta?

Correct AnswerverifiedShow Answer

A person with a residual respiratory volume of 750 mL, a tidal volume of 500 mL, and a total lung capacity of 4500 mL would have a vital capacity of

Correct AnswerverifiedShow Answer

The circulatory system of bony fishes, rays, and sharks is similar to

Correct AnswerverifiedShow Answer

If a molecule of CO₂ released into the blood in your left toe is exhaled from your nose, it must pass through all of the following except

Correct AnswerverifiedShow Answer

When the air in a testing chamber is specially mixed so that its oxygen content is 10% and its overall air pressure is 400 mm Hg, then PO₂ is

Correct AnswerverifiedShow Answer

After completing a race, a runner's heart rate begins to decelerate. Which of the following is responsible for this?

Correct AnswerverifiedShow Answer

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