Question 1

How is most CO2 transported in blood?

Accepted Answer

A)   CO2 reacts with water in the blood to form bicarbonate ions.
B)   Bicarbonate interacts with water to produce CO2.
C)   O2 binds with the CO2 to produce bicarbonate ions.
D)   Hemoglobin binds the CO2 to produce bicarbonate ions.
E)   Hemocyanin and hemoglobin bind CO2 and O2 to form copper.F) A) and D)
G) C) and D)

Question 2

In arthropods,the exchange of substances between the blood and tissue cells occurs

Accepted Answer

A)   in the arteries.
B)   in the arterioles.
C)   in the capillaries.
D)   in the venules.
E)   directly.F) C) and E)
G) A) and B)

Question 3

Below the level of the heart,the movement of blood in the veins toward the heart is caused primarily by

Accepted Answer

A)   gravity.
B)   the contraction of venous walls.
C)   cilia lining the veins.
D)   the contraction of nearby skeletal muscles.
E)   venous capacitance.F) C) and D)
G) A) and E)

Question 4

As compared to the circulatory system of most fishes,the circulatory system of adult amphibians has the advantage of

Accepted Answer

A)   a four-chambered heart.
B)   heart metamorphosis.
C)   a partial separation between breathing-organ and systemic circulation.
D)   a pocket of the gut that serves as an air bladder.
E)   a separation between oxygenated and deoxygenated blood.F) None of the above
G) B) and C)

Question 5

Hemoglobin and hemocyanin

Accepted Answer

A)   are both used by vertebrates to transport O2.
B)   both have iron-containing proteins.
C)   are blue when oxygen levels are low and red when oxygen levels are high.
D)   are found inside blood cells.
E)   both transport oxygen.F) D) and E)
G) B) and C)

Question 6

A paleontologist finds a fragment of a fossilized vertebrate that indicates that the animal had a three-chambered heart.The animal could have been a(n)

Accepted Answer

A)   tuna.
B)   lizard.
C)   primate.
D)   eagle.
E)   crayfish.F) C) and D)
G) B) and D)

Question 7

Which vertebrate has a three-chambered heart and both pulmonary and systemic circuits?

Accepted Answer

A)   Fish
B)   Lungfish
C)   Amphibian
D)   Cheetah
E)   BirdF) B) and E)
G) B) and C)

Question 8

The breathing-organ circuit in a horse

Accepted Answer

A)   transports oxygen to the lungs.
B)   transports oxygen to the brain.
C)   exchanges carbon dioxide for oxygen in the lungs.
D)   carries food waste away from the heart.
E)   removes waste from the heart.F) D) and E)
G) A) and B)

Question 9

A circulatory system's sophistication

Accepted Answer

A)   is often correlated with a species' need for gas transport.
B)   is often correlated with a species' need for food transport.
C)   is not correlated with any metabolic functions.
D)   varies depending on the current environment conditions an organism lives in.
E)   depends on the amount of CO2 in the lungs.F) B) and E)
G) D) and E)

Question 10

The circulatory system of an earthworm circulates blood

Accepted Answer

A)   by the pumping action of multiple four-chambered hearts.
B)   by peristaltic waves generated by contraction of muscular blood vessels.
C)   using an open circulatory system.
D)   using one centrally located heart.
E)   through the heart,to the lungs,back to the heart,and out to the systemic tissues.F) A) and D)
G) D) and E)

Question 11

Atrial fibrillation occurs when the heart begins generating electrical impulses due to faulty signals originating in more than one area of the heart.What region of the heart that normally controls the rhythm of the heartbeat is being overridden in patients with atrial fibrillation?

Accepted Answer

A)   Atriventricular node
B)   Sinoatrial node
C)   Aorta
D)   Pulmonary valve
E)   Common carotid arteryF) B) and C)
G) C) and D)

Question 12

Which statement about veins is false?

Accepted Answer

A)   Blood pressure is very low in veins,necessitating one-way valves to prevent backflow.
B)   Contractions of skeletal muscles squeeze the veins,which move blood to the heart.
C)   The walls of veins are more expandable than the walls of arteries.
D)   Veins serve as a blood reservoir.
E)   As blood flows from the capillaries to the veins and back to the heart,the linear velocity slows to almost zero.F) B) and E)
G) A) and B)

Question 13

In an open circulatory system,

Accepted Answer

A)   there is no heart.
B)   blood does not pass through the gills.
C)   there are no blood vessels.
D)   hemolymph flows out of the body.
E)   there is no distinction between hemolymph and interstitial fluid.F) A) and B)
G) C) and E)

Question 14

In fish,blood circulates through _______ circuit(s) ,whereas in mammals,it circulates through _______ circuit(s) .

Accepted Answer

A)   one complete;two complete
B)   two complete;two partial
C)   one partial;two complete
D)   two complete;four complete
E)   four complete;one partialF) None of the above
G) B) and C)

Question 15

Defective heart valves that do not close completely could result in

Accepted Answer

A)   oxygen-rich blood mixing with oxygen-depleted blood.
B)   increased pulmonary flow.
C)   venous gas exchange within the heart chambers.
D)   atrial exchange of excess blood.
E)   some blood flowing back into the atrium with each heartbeat.F) C) and D)
G) D) and E)

Question 16

Which statement about vertebrate circulatory systems is false?

Accepted Answer

A)   In fish,oxygenated blood from the gills returns to the heart through the left atrium.
B)   In amphibians,blood from the systemic tissues enters the heart through the right atrium.
C)   In reptiles,the blood in the pulmonary artery has a lower oxygen content than the blood in the aorta.
D)   In birds,the pressure in the aorta is higher than the pressure in the pulmonary artery.
E)   In mammals,deoxygenated blood leaves the heart through the pulmonary artery.F) A) and E)
G) None of the above

Question 17

The amphibian heart

Accepted Answer

A)   pumps only oxygenated blood.
B)   pumps only oxygen-depleted blood.
C)   pumps both oxygenated and oxygen-depleted blood.
D)   has a completely divided ventricle to prevent mixing of oxygenated and oxygen-depleted blood.
E)   is a single circulatory loop system.F) A) and B)
G) B) and E)

Question 18

Which of the following is not a mechanism that facilitates return of venous blood to the heart?

Accepted Answer

A)   Gravity,for veins that are above the heart
B)   Contraction of skeletal muscles
C)   Breathing
D)   Contraction of smooth muscle in most veins of the body
E)   Valves in veinsF) None of the above
G) B) and D)

Question 19

A patient feels faint and has low blood pressure.An echocardiogram of the heart shows that the atrioventricular valve between the left atrium and left ventricle does not close completely,a condition called mitral valve prolapse.This can result in low blood pressure,because with each heartbeat the left ventricle is

Accepted Answer

A)   overfilling with blood during each cardiac cycle.
B)   pumping less blood than normal to the lungs.
C)   pumping more blood than normal to the lungs.
D)   pushing more blood than normal out to the systemic circuit.
E)   pushing less blood than normal out to the systemic circuit.F) B) and E)
G) A) and B)

Question 20

The blood vessels with the greatest capacity to store blood are the

Accepted Answer

A)   arteries.
B)   arterioles.
C)   capillaries.
D)   veins.
E)   venules.F) D) and E)
G) A) and B)

Exam 32: Circulation

The amphibian heart

Correct Answer
verified

The breathing-organ circuit in a horse

Correct Answer
verified

Which of the following is not a mechanism that facilitates return of venous blood to the heart?

Correct Answer
verified

How is most CO₂ transported in blood?

Correct Answer
verified

A circulatory system's sophistication

Correct Answer
verified

As compared to the circulatory system of most fishes,the circulatory system of adult amphibians has the advantage of

Correct Answer
verified

In an open circulatory system,

Correct Answer
verified

In fish,blood circulates through _ circuit(s) ,whereas in mammals,it circulates through _ circuit(s) .

Correct Answer
verified

In arthropods,the exchange of substances between the blood and tissue cells occurs

Correct Answer
verified

Which statement about veins is false?

Correct Answer
verified

Which vertebrate has a three-chambered heart and both pulmonary and systemic circuits?

Correct Answer
verified

Below the level of the heart,the movement of blood in the veins toward the heart is caused primarily by

Correct Answer
verified

A paleontologist finds a fragment of a fossilized vertebrate that indicates that the animal had a three-chambered heart.The animal could have been a(n)

Correct Answer
verified

Which statement about vertebrate circulatory systems is false?

Correct Answer
verified

Hemoglobin and hemocyanin

Correct Answer
verified

Defective heart valves that do not close completely could result in

Correct Answer
verified

The circulatory system of an earthworm circulates blood

Correct Answer
verified

Atrial fibrillation occurs when the heart begins generating electrical impulses due to faulty signals originating in more than one area of the heart.What region of the heart that normally controls the rhythm of the heartbeat is being overridden in patients with atrial fibrillation?

Correct Answer
verified

The blood vessels with the greatest capacity to store blood are the

Correct Answer
verified

Correct Answer
verified

Exam 32: Circulation

The amphibian heart

Correct AnswerverifiedShow Answer

The breathing-organ circuit in a horse

Correct AnswerverifiedShow Answer

Which of the following is not a mechanism that facilitates return of venous blood to the heart?

Correct AnswerverifiedShow Answer

How is most CO2 transported in blood?

Correct AnswerverifiedShow Answer

A circulatory system's sophistication

Correct AnswerverifiedShow Answer

As compared to the circulatory system of most fishes,the circulatory system of adult amphibians has the advantage of

Correct AnswerverifiedShow Answer

In an open circulatory system,

Correct AnswerverifiedShow Answer

In fish,blood circulates through _______ circuit(s) ,whereas in mammals,it circulates through _______ circuit(s) .

Correct AnswerverifiedShow Answer

In arthropods,the exchange of substances between the blood and tissue cells occurs

Correct AnswerverifiedShow Answer

Which statement about veins is false?

Correct AnswerverifiedShow Answer

Which vertebrate has a three-chambered heart and both pulmonary and systemic circuits?

Correct AnswerverifiedShow Answer

Below the level of the heart,the movement of blood in the veins toward the heart is caused primarily by

Correct AnswerverifiedShow Answer

A paleontologist finds a fragment of a fossilized vertebrate that indicates that the animal had a three-chambered heart.The animal could have been a(n)

Correct AnswerverifiedShow Answer

Which statement about vertebrate circulatory systems is false?

Correct AnswerverifiedShow Answer

Hemoglobin and hemocyanin

Correct AnswerverifiedShow Answer

Defective heart valves that do not close completely could result in

Correct AnswerverifiedShow Answer

The circulatory system of an earthworm circulates blood

Correct AnswerverifiedShow Answer

Atrial fibrillation occurs when the heart begins generating electrical impulses due to faulty signals originating in more than one area of the heart.What region of the heart that normally controls the rhythm of the heartbeat is being overridden in patients with atrial fibrillation?

Correct AnswerverifiedShow Answer

The blood vessels with the greatest capacity to store blood are the

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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verified

Correct Answer
verified

Correct Answer
verified

How is most CO₂ transported in blood?

Correct Answer
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Correct Answer
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Correct Answer
verified

In fish,blood circulates through _ circuit(s) ,whereas in mammals,it circulates through _ circuit(s) .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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