Early Doctors Did Not Understand That Blood Flowed in a Circuit

question 11

Multiple Choice

Early doctors did not understand that blood flowed in a circuit. Instead, they assumed that blood ebbed and flowed like a tide in the body. William Harvey was the first to demonstrate the circulation of blood and convince the medical community. Which of the following observations would be evidence that blood was pumped through the body or flowed in a circuit?

• A) Dissecting a live fish shows the heart beating and blood moving, gushing one direction.
• B) A very tight tourniquet causes the arteries to swell on the side toward the heart, but not on the side of the ligature away from the heart.
• C) Measuring the volume of the heart and counting the beats per minute gives a value of 520 pounds of blood an hour, many times a person's volume.
• D) In surface veins, blood can be pressed past a valve toward the heart but not away from the heart.
• E) A cut made anywhere on the body results in blood seeping from the wound.

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Definitions:

Cortex

The outer layer of an organ or structure, such as the brain or kidney, involved in various functions depending on the specific organ.

Surface Area

The total area exposed on the surface of an object or material.

Corpus Callosum

A broad band of nerve fibers joining the two hemispheres of the brain, facilitating communication between them.

White Matter

Bundles of parallel axons with their associated sheath in the central nervous system.