Biology, 12.03.2020 21:39 kaylijocombs

As part of their orientation to a cardiac care unit, a group of recent nursing graduates is receiving a refresher in cardiac physiology from the unit educator. Which teaching point best captures a component of cardiac function?

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Answer from: brisamauro27

The options

A) "Efficient heart function requires that the ventricles do not retain any blood at the end of the cardiac cycle."

B) "Recall that the heart sounds that we listen to as part of our assessments are the sounds of the myocardium contracting."

C) "The diastolic phase is characterized by relaxation of ventricles and their filling with blood."

D) "Aortic pressure will exceed ventricular pressure during systole."

The CORRECT ANSWER IS C)

C) "The diastolic phase is characterized by relaxation of ventricles and their filling with blood."

Explanation:

Diastole is connected with ventricular filling and relaxation. Cardiac production is not 100% or in proximity to been 100% with every cardiac cycle, as the heart sounds are linked with valve closure. Ventricular pressure surpasses that of the aorta in the course of the systole.

Answer from: Quest

you are certainly talking about this picture:

a: is the label of the white square, it is showing the replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes the dna with the dna template and increases the processivity of the enzyme. ==> stops polymerase from falling off the template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built in the opposite sense of the helicase, so dna will be built in fragments ==> built fragments from 5' to 3 joins

and finally f: is the enzyme that builds the new dna strand (dna polymerase) ==> adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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