Anatomy & Physiology
1st Edition
ISBN: 9781938168130
Author: Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher: OpenStax College
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Textbook Question
Chapter 19, Problem 20RQ
What happens to preload when there is venous constriction in the veins?
- It increases.
- It decreases.
- It remains constant.
- There is no way to predict.
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What is occurring during ventricular ejection ? The AV valves are closed and the semilunar valves are open as blood is leaving the ventricles . The AV valves are open and the semilunar valves are closed as ventricular pressure is . increasing The AV valves are open and the semilunar valves are closed as blood is leaving the ventricles . The AV and semilunar valves are closed as ventricular pressure is increasing .
Why is the delay in electrical conduction between the atria and the ventricles important?
Tachycardia results if the delay is absent.
Atria must contract to fill the ventricles with blood.
AV valves must have time to close slowly.
Bradycardia results if the delay is absent.
Blood pressure increases with all of the following except increased..?
force of cardiac contraction.
peripheral resistance.
cardiac output.
parasympathetic innervation.
blood volume.
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Chapter 19 Solutions
Anatomy & Physiology
Ch. 19 - Visit this site...Ch. 19 - Which of the following is not important in...Ch. 19 - Which valve separates the left atrium from the...Ch. 19 - Which of the following lists the valves in the...Ch. 19 - Which chamber initially receives blood from the...Ch. 19 - The ________ layer secretes chemicals that help to...Ch. 19 - The myocardium would be the thickest in the...Ch. 19 - In which septum is it normal to find openings in...Ch. 19 - Which of the following is unique to cardiac muscle...Ch. 19 - The influx of which ion accounts for the plateau...
Ch. 19 - Which portion of the ECG corresponds to...Ch. 19 - Which component of the heart conduction system...Ch. 19 - The cardiac cycle consists of a distinct...Ch. 19 - Most blood enters the ventricle during ________....Ch. 19 - The first heart sound represents which portion of...Ch. 19 - Ventricular relaxation immediately follows...Ch. 19 - The force the heart must overcome to pump blood is...Ch. 19 - The cardiovascular centers are located in which...Ch. 19 - In a healthy young adult, what happens to cardiac...Ch. 19 - What happens to preload when there is venous...Ch. 19 - Which of the following is a positive inotrope? Na+...Ch. 19 - The earliest organ to form and begin function...Ch. 19 - Of the three germ layers that give rise to all...Ch. 19 - The two tubes that eventually fuse to form the...Ch. 19 - Which primitive area of the heart will give rise...Ch. 19 - The pulmonary trunk and aorta are derived from...Ch. 19 - Describe how the valves keep the blood moving in...Ch. 19 - Why is the pressure in the pulmonary circulation...Ch. 19 - Why is the plateau phase so critical to cardiac...Ch. 19 - How does the delay of the impulse at the...Ch. 19 - How do gap junctions and intercalated disks aid...Ch. 19 - Why do the cardiac muscles cells demonstrate...Ch. 19 - Describe one cardiac cycle, beginning with both...Ch. 19 - Why does increasing EDV increase contractility?Ch. 19 - Why is afterload important to cardiac function?Ch. 19 - Why is it so important for the human heart to...Ch. 19 - Describe how the major pumping chambers, the...
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- Clusters of neurons in the medulla oblongata that regulate blood pressure are known collectively as ________. baroreceptors angioreceptors the cardiomotor mechanism the cardiovascular centerarrow_forwardSeveral years ago the deaths of several airline travelers led to warnings about economy-class syndrome. The idea is that economy-class passengers dont have as much leg room as passengers in more expensive seats, so they are more likely to sit essentially motionless for long periods on flightsconditions that may allow blood to pool and clots to form in the legs. This condition is called deep-vein thrombosis, or DVT. Given what you know about blood flow in the veins, explain why periodically getting up and moving around in the planes cabin during a long flight may lower the risk that a clot will form.arrow_forwardWhat is the main function of the fibrous tissues of the blood vessels? Allows vessels to stretch and rebound with force and allows vasodilation Vasodilation and vasoconstriction Evening blood flow as heart beats and allows vasodilation Evening blood flow as heart beats and allows vessels to stretch and rebound with force None of these is correctarrow_forward
- When seated in a normal upright position, what would you expect the systolic blood pressure to be when measured from the arm while it is raised above the head? Higher than when measured from the arm in its relaxed resting position by your side Not detectable since systolic pressure can only be detected from arteries at or below the level of the heart The same as when measured from the arm in its relaxed resting position by your side since position has no effect on systolic pressure Lower than when measured from the arm in its relaxed resting position by your side. Platelete SENARENGGANESH THERE ARE MORIENDRASE S Motors KOPJONGSTE D D DE PROarrow_forwardAll valves are closed, ventricular pressure decreases. Blood flows passively through the atria and AV valves. All valves are closed; ventricular pressure increases. Blood is forced through the semilunar valves by high pressure. Receiving chamber pressure increases; more blood exits through AV valves. Left atrium: Right atrium- Left ventricle Right ventricle- Ventricular filling Atrial contraction Mid-to-late diastole (ventricular filling) Isovolumetric Ventricular contraction phase ejection phase Ventricular systole (atria in diastole) Isovolumetric relaxation 3 Early diastolearrow_forwardPrecapillary sphincters are found in metarterioles and serve to: OPrevent blood from flowing backwards Provide a control point regulating blood flow into a capillary bed Increase pressure in a capillary bed None of the abovearrow_forward
- Systemic vasoconstriction decreases blood pressure. True or Falsearrow_forwardWhat is the easiest way to change blood flow? change vascular resistance change blood pressure gradient none of the answers are correctarrow_forwardthe liquid viscosity is density intendent. True False during the diastolic of the cardiac cycle the pressure for healthy adult person is typically about 120mm Hg. True False the presence of more positive ions on the inside of the membrane of neuron is said to be polarized True False liquid has property it surface tend to contract to maximum area therefor in a state of tension True ! Falsearrow_forward
- Which of the following are intrinsic factors that regulate blood flow? Choose all that apply. Vasopressin (antidiuretic hormone) Histamines and nitric oxide Metabolic activity Parasympathetic nervous system Increased carbon dioxide concentrationarrow_forwardWhich represents time for the passage of the electrical impulse through the atrium, causing atrial depolarization. Which represents time for depolarization of both ventricles. Which represents time for ventricular repolarization. Which represents the time taken for the entire electrical depolarization and repolarization of the ventricles. ["QRS complex", "T wave", "P wave" , "P-R interval", "QRS interval", "ST segment", "QT interval"arrow_forwardDuring an electrocardiogram, the O T-wave represents atrial depolarization. QRS complex represents ventricular repolarization. P-wave represents atrial depolarization. O Q-T interval represents ventricular repolarization.arrow_forward
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