Group 3- Section 17.4-17.5

Calculate the end-systolic volume (ESV) if the end-diastolic volume (EDV) in a resting heart is 110 ml and stroke volume (SV) is 70 ml.

40 ml

Approximately how much blood is pumped from each ventricle during the ventricular ejection phase?

70 ml

What percentage of atria blood flows passively into the ventricles?

80%

Which of the following chemical messengers decreases heart rate? A.)Norepinephrine B.)Epinephrine C.)Glucagon D.)Acetylcholine

Acetylcholine

Which of the following terms refers to the force the ventricles must overcome to eject blood into their respective arteries?

Afterload

Which hormone decreases cardiac output by decreasing blood volume and preload?

Atrial natriuretic peptide

What largely determines preload?

End-diastolic volume (EDV)

Which of the following factors would increase cardiac output to the greatest extent?

Increased heart rate and increased stroke volume

During what phase is the S1 heart sound first heard?

Isovolumetric contraction phase

Which chamber generates the highest pressure during systole?

Left ventricle

What is the volume of blood pumped out by one ventricle per heart beat?

Stroke volume (SV)

What two values are needed to calculate cardiac output (CO) for a ventricle?

Stroke volume (SV) and heart rate (HR)

Which cranial nerves have a negative chronotropic effect on heart rate?

Vagus nerves (CN X)

According to the Frank-Starling law, a bigger preload will result in __________.

a stronger contraction

Which of the following paths does an action potential in the heart normally take? A.)SA node atrial contractile cells AV node where it is delayed AV bundle right and left bundle branches Purkinje fibers ventricular contractile cells B.)AV bundle AV node where it is delayed right and left bundle branches Purkinje fibers ventricular contractile cells SA node atrial contractile cells C.)Purkinje fibers ventricular contractile cells SA node atrial contractile cells AV bundle AV node where it is delayed right and left bundle branches D.)SA node AV bundleright and left bundle branches atrial contractile cells AV node where it is delayed Purkinje fibers ventricular contractile cells

a.)SA node atrial contractile cells AV node where it is delayed AV bundle right and left bundle branches Purkinje fibers ventricular contractile cells

High-pressured blood in the ventricles ________.

forces the semilunar valves open

The degree of stretch experienced by the sarcomeres in the ventricle cells before they contract is called __________.

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