Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 40, Problem 11RQ
The heart's internal pacemaker beats by:
- an internal implant that sends an electrical impulse through the heart
- the excitation of cardiac muscle cells at the sinoatrial node followed by the atrioventricular node
- the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node
- the action of the sinus
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The heart’s pacemaker is called the (complete term)_________. The pacemaker is composed of specialized________. The pacemaker first sends impulses that stimulate contraction of both_______. The (complete term)________introduces a delay in the transmission of pacemaker signals into the ventricles. Signals are conducted from this node directly into fibers called the________ . If the pacemaker loses control of heart contractions, ineffective quivering of the heart muscle, called_________, may occur.
Chapter 40 Solutions
Biology 2e
Ch. 40 - Figure 40.10 Which of the following statements...Ch. 40 - Figure 40.11 Which of the following statements...Ch. 40 - Figure 40.17 Varicose veins are veins that become...Ch. 40 - Why are open circulatory systems advantageous to...Ch. 40 - Some animals use diffusion instead of a...Ch. 40 - Blood flow that is directed through the lungs and...Ch. 40 - White blood cells: can be classified as...Ch. 40 - Platelet plug formation occurs at which point?...Ch. 40 - In humans, the plasma comprises what percentage of...Ch. 40 - The red blood cells of birds differ from mammalian...
Ch. 40 - The heart's internal pacemaker beats by: an...Ch. 40 - During the systolic phase of the cardiac cycle,...Ch. 40 - Card io myocytes are similar to skeletal muscle...Ch. 40 - How do arteries differ from veins? Arteries have...Ch. 40 - High blood pressure would be a result of...Ch. 40 - Describe a closed circulatory systemCh. 40 - Describe systemic circulationCh. 40 - IS. Describe the cause of different blood type...Ch. 40 - List some of the functions of blood in the body.Ch. 40 - How does the lymphatic system work with blood...Ch. 40 - Describe the cardiac cycleCh. 40 - What happens in capillaries?Ch. 40 - How does blood pressure change during heavy...
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- _____ contraction drives blood through the systemic and pulmonary circuits; outside the heart, blood pressure is highest in the _____. a. Atrial; ventricles b. Atrial; atria c. Ventricular; arteries d. Ventricular; aortaarrow_forwardFigure 40.11 Which of the following statements about the heart is false? The mitral valve separates the left ventricle from the left atrium. Blood travels through the bicuspid valve to the left atrium. Both the aortic and the pulmonary valves are semilunar valves. The mitral valve is an atrioventricular valve.arrow_forwardClusters of neurons in the medulla oblongata that regulate blood pressure are known collectively as ________. baroreceptors angioreceptors the cardiomotor mechanism the cardiovascular centerarrow_forward
- The contraction phase of the heartbeat is ______; the relaxation phase is _______.arrow_forwardThe cardiac cycle includes all the events associated with the flow of blood through the heart during a single complete heartbeat. Indicate if the following statements are True/False. When ventricular pressure exceeds atrial pressure, the atrioventricular valves open.arrow_forwardThe Greek anatomist Erasistratus, originally from Ceos, identified the correct function of the right atrioventricular valve of the human heart, which was to prevent backward flow of blood from: the right ventricle to the right atrium the right ventricle to the left ventricle the right ventricle to the left atrium the left ventricle to the right ventricle the left ventricle to the left atriumarrow_forward
- How does the L-type voltage-gated channels on the contractile myocardial fibers rapidly closing affect the heart? the on the contractile myocardial cells will have a lower resting potential long action potentials on the contractile myocardial cells faster depolarization in the contractile myocardial cells Shorter action potentials on the contractile myocardial cells larger magnitude of depolarization in the contractile myocardial cellsarrow_forwardAll of the followings are correct about the myogenic pacemaker except, --------------------- They are specialized muscle cells capable of spontaneous activity Latent pacemaker produces an irregular and lower heart rate If the latent pacemaker becomes uncoupled from the pacemaker, it might beat and control a portion of the heart at a different rate. All cardiac cells are electrically coupled, the ones with fastest intrinsic activity will stimulate the whole heart and determine the heart rate After each AP, the membrane undergoes steady depolarizationarrow_forwardisovolumetric contraction isovolumetric relaxation ventricular filling ventricular ejection closed rises S1 drops depolarize S2 The first phase of the cardiac cycle is . This is when a lot of blood is in the atria, which causes atrial pressure to be higher than the ventricles. The atrioventricular valves open, and blood moves from the atria to the ventricles. At the end of this phase, the atria contract to maintain pressure and blood flow into the ventricles. As blood leaves the atria, the pressure in the atria As blood enters the ventricles, the pressure in the ventricles Towards the end of this phase, the pressure in the ventricles will exceed the pressure in the atria. At this point, the heart enters the second phase of the cardiac cycle: At this point, the AV valves shut, and we hear . The atria repolarize and the ventricles (due to the QRS complex of the ECG), causing ventricular contraction. Although contracting, it is not yet moving blood into the arteries. All 4 heart valves…arrow_forward
- Diastole and systole are terms that address the contracting and relaxing of the heart. Which of the following statements about diastolic and systolic blood pressure are true? Select all that apply. The diastolic blood pressure reading is the second number that is read and it's a measurement of the pressure of the arteries as the heart contracts and beats. The systolic blood pressure reading is the first number that is read and it's a measurement of the pressure of the arteries as the heart contracts and beats. The systolic blood pressure reading is the first number that is read and it's a measurement of the pressure in the arteries when the heart rests between beats. Systole refers to when the heart contracts and blood flows from atria into ventricles. The diastolic blood pressure reading is the second number that is read and it's a measurement of the pressure in the arteries when the heart rests between beats Diastole refers to when the heart contracts and the blood flows from the…arrow_forwardThe rapid depolarization phase of heart pacemaker cells is caused by which of the following? movement of Na+ through funny channels movement of Ca++ through L-type channels movement of Na+ and Ca++ through funny channels movement of K+ through funny channels all of the abovearrow_forwardMatch the area where blood will flow within the heart during systole (1 point) If blood is in the right atria during diastole, during systole it will move to: If blood is in the right ventricle during diastole, during systole it will move to: If blood is in the left atria during diastole, during systole it will move to: If blood is in the left ventricle during diastole, during systole it will move to: Choose... Choose... The Systemic circulation (body) The Right Ventricle The Pulmonary Circuit The Left Ventricle Choose... ÷ +arrow_forward
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