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- Which of the following slows the heart rate and AV conduction? A. Resting membrane potential B. Parasympathetic nervous system C. Pacemaker D. Phase 0The heartbeat includes: a. the systole when the heart relaxes and fills. b. the diastole when the heart contracts and empties. c. pressure that causes the AV valves to open, filling the ventricles. d. rising pressure in the ventricles to open the AV valves and close the SL valves. e. the lub sound when the SL valves open and the dub sound when the AV valves close.When the systemic blood pressure increases, the aortic and carotid sinus baroreceptors initiate reflexes that cause a/an 1. Increased heart rate 2. Decreased ventilatory rate 3. Increased ventilatory rate 4. Decreased heart rate A. 1 only B. 2 only C. 3 only D. 2 and 4 only
- A characteristic of blood circulation through or to the heart is that: a. the superior vena cava conveys blood to the head. b. the inferior vena cava conveys blood to the right atrium. c. the pulmonary arteries convey blood from the lungs to theleft atrium. d. the pulmonary veins convey blood into the left ventricle. e. the aorta branches into two coronary arteries that conveyblood from heart muscle.The tricuspid valve lies between the A. Right atrium and the right ventricle B. Left ventricle and the aorta C. Right ventricle and the pulmonary artery D. Left atrium and the left ventricle9. The force the ventricles must work against to pump blood is called A. Myocardial contractility B. Ventricular afterload C. Negative inotropism D. Ventricular preload
- The diving reflex consists of 1. Tachycardia 2. Decreased cardiac output 3. Bradycardia 4. Peripheral vasoconstriction A. 2 only B. 3 and 4 only C. 1 and 3 only D. 2, 3, and 4 only1. Which phase of Ventricular Filling increases the volume of blood in the ventricles the most? A.Isovolumetric Relaxation B.Diastasis C.Atrial Systole D.Rapid Filling 2. Which graph would most directly show ventricular ejection? A.Atrial, Ventricular, and Aortic Pressure B.The EKG C.Heart Ausculatation D.Volume of Blood in the Ventricles1. What happens when the pressure in the ventricles becomes lower than the pressure in the atria? A.the semilunar valves open B.the semilunar valves close C.the atrioventricular valves open D.the first heart sound occurs 2. Pressure is changed by changing ___ which the ventricles control through contraction and relaxation. A.temperature B.flow C.resistance D.volume E.charge 3. If the pressure in the ventricles is higher than the pressure in the atria, but lower than the pressure in the great arteries, which of the following is true? A.semilunar valves will be closed, but the atrioventricular valves will be open, ventricles will be filling B.both the atrioventricular and semilunar valves will be open and there will be flow through the ventricles C.the atrioventricular valves will be closed, but the semilunar valves will be open, ventricles will be ejecting blood C.both the atrioventricular and semilunar valves will be closed…
- 1- The left ventricular wall of the heart is thicker than the right wall in order to . A) accommodate a greater volume of blood B) pump blood through a smaller valve C) expand the thoracic cage during diastole D) pump blood with greater pressure 2- Blood within the pulmonary veins returns to the . A) left atrium B) left ventricle C) right atrium D) right ventricle 3- The condition where fluid compresses the heart and limits its ability to contract is called . A) angina pectoris B) myocardial infarction C) cardiac tamponade D) pericarditis thsi are small questions please answer for all of them asap.1. The source of the electrical currents that you measured on the skin throughout a normal electrocardiogram is: a. regional differences in depolarization state between parts of the myocardium b. The SA node cells c. the opening and closing of the tricuspid and bicuspid valves d. depolarizations of the muscle and nerve cells close to the electrode site e. The AV node cells 2. Release or discharge from which of the following is likely to produce a slowing in the rate at which the AV node transmits a depolarization? a. Your coffee cup (caffeine) b. the posterior lobe of the pituitary gland (Oxytocin) c. the sympathetic nervous system d. the parasympathetic nervous system (vagus nerve) e. the medulla of the adrenal gland (epinephrine) 3.Which of the following is unlikely to affect the force of contraction of an individual ventricular myocyte (muscle cell)? a. the amount of…Which of the following is true about the pacemaker potential in the heart? a. Decreased K+ efflux causes the resting membrane potential to increase b. Action potential occurs when T-type Ca2+ channels open c. Only the SA node in the heart has a pacemaker potential d. The atrioventricular node is needed to pace the sinoatrial node e. None of the options are true