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Biology MCQ

When fibrin levels increase, thrombin production is inhibited. this is an example of a __________.

Positive feedback loop

Vascular spasm

Negative feedback loop

Fibrinolysis

Answer

Correct Answer: Negative feedback loop

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A ___________________ drug increases the force of contraction of the heart.

Positive inotropic

Potassium and sodium

Potassium

None of the above

Answer

Correct Answer: Positive inotropic

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A rapid, irregular heartbeat is a symptom of __________.

Stroke

Heart failure

Atherosclerosis

High blood pressure

Answer

Correct Answer: Heart failure

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__________ of the population of the united states is obese.

10%

25%

33%

50%

Answer

Correct Answer: 33%

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The net pressure gradient in the cardiovascular system is created by _____.

The pumping action of the heart.

Carbohydrate utilization increases

Larger molecules or structures are built from smaller ones

Structural proteins are used as a potential energy source

Ketone bodies are formed

Answer

Correct Answer: The pumping action of the heart.

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At rest, the _____________ receive(s) about 50% of cardiac output.

Liver and kidneys

Skin

Arteries

Answer

Correct Answer: Liver and kidneys

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The respiratory pump facilitates the return of blood to the heart by ________.

Raising the pressure gradient between abdominal and thoracic veins during inspiration

A gradual increase in pressure that resets the baroreceptors

Squeezing blood from the rhythmic contraction of the diaphrag

Answer

Correct Answer: Raising the pressure gradient between abdominal and thoracic veins during inspiration

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Heart murmurs caused by a stenotic mitral valve ______

Are detected while blood flow into the left ventricle is reduced

Are detected due to the turbulent blood flow that occurs as blood backflows into the left atrium

Are detected if the valve's cusps are thin and flexible

All of the listed responses are true

Answer

Correct Answer: Are detected while blood flow into the left ventricle is reduced

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