Early Doctors Did Not Understand That Blood Flowed in a Circuit

question 23

Multiple Choice

Early doctors did not understand that blood flowed in a circuit but 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:

Guanine

One of the four main nucleobases found in the nucleic acids DNA and RNA, characterized by a double-ring structure that pairs with cytosine.

Messenger RNA

A type of RNA that carries genetic information from DNA to the ribosome, where it specifies the amino acid sequence of the protein products of gene expression.

Ribosomal RNA

A molecular component of ribosomes, essential for protein synthesis in all living organisms, constituting the enzymatic and structural platform for the translation of mRNA into proteins.

Transfer RNA

A type of RNA molecule that helps decode a messenger RNA (mRNA) sequence into a protein during the process of translation.