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Select the correct answer for each question. Explain why you chose that answer as opposed to the others. In other words, explain why the other choices are incorrect.
If the vagal nerves to the heart were cut, the result would be that _____.
-
- The heart rate would increase by about 25 beats per minute.
- Parasympathetic stimulation would increase, causing a decrease in heart rate.
- The heart would stop, since the vagal nerves trigger the heart to contract.
- Pacemaker cells would cease to spontaneously depolarize.
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Solved in 2 steps
- Select the correct answer for each question. Explain why you chose that answer as opposed to the others. In other words, explain why the other choices are incorrect. The plateau phase of an action potential in cardiac muscle cells is due to the _____. Efflux of K+ through K+ channels Efflux of Ca2+ through fast Ca2+ channels Influx of Ca2+ through slow Ca2+ channels Influx of Na+ through fast Na+ channelsSelect the correct answer for each question. Explain why you chose that answer as opposed to the others. In other words, explain why the other choices are incorrect. Select the correct statement about the function of myocardial cells. Cardiac muscle cells are innervated by sympathetic, parasympathetic, and somatic nerve fibers so that the nervous system can increase heart rate. The refractory period in skeletal muscle is much longer than that in cardiac muscle. The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction. The entire heart contracts as a unit or it does not contract at all.Select the correct answer for each question. Explain why you chose that answer as opposed to the others. In other words, explain why the other choices are incorrect. Hemorrhage with a large loss of blood causes _____. No change in blood pressure but a slower heart rate. No change in blood pressure but a change in respiration. A lowering of blood pressure due to change in cardiac output. A rise in blood pressure due to change in cardiac output.
- Please answer all 3 questions below. These are the only questions left. Question 14 Select one answer.One of the determinants of blood pressure is cardiac output. Which of the following most directly determine cardiac output? a. stroke volume and vascular diameter b. stroke volume and heart rate c. viscosity and heart rate d. arteriolar diameter and viscosity NOTE: C IS INCORRECT Question 15 Select one answer. One of the determinants of blood pressure is vascular resistance. Which of the following lists each of the factors that most directly determine vascular resistance? a. vessel diameter and vessel length b. viscosity, vessel diameter, vessel length, and hematocrit c. viscosity, vessel diameter, and vessel length d. viscosity, vessel diameter, vessel length, and flow through the vessel NOTE: A IS INCORRECT Question 25 Select one answer. Right ventricular systolic pressure is less than left ventricular systolic pressure because __________. a. the right ventricle pumps less blood b.…Below is the homeostatic reflex arc for heart rate and blood pressure. Please note that this homeostatic reflex begins once the activity has stopped to reset resting HR. Please match the following statements (on the left) to the appropriate steps in the pathway (on the right). You will use each match once. Heart rate slows Medulla oblongata 1. Stimulus 2. Receptor SA node (pacemaker) of heart 3. Integrating center Decreased CO2 waste products due to decreased oxygen consumption. 4. Effector 5. Response Baroréceptors that monitor stretch of aorta and how fast the heart is beating. 1Your grandmother, who has been a non-smoker and relatively he her life, has recently noticed that she is becoming increasingly short of breath as she does simple things (such as cimbing the steps in her house). She has also noticed that her heart rate increases when she does mild exercise (such as climbing the stairs or walking outside to get the mail). throughout O causing this?
- If the left side of the heart fails, then __________________________ Group of answer choices 1)the heart is unable to move blood from the pulmonary circuit to the systemic circuit at the rate needed. This would result in the back up of blood in the lower legs with resulting edema 2)the heart is unable to move blood from the systemic circuit to the pulmonary circuit at the rate needed. This would result in the back up of blood in the aorta. 3)blood would not back up at all, but rather pressure would increase in the left ventricle. 4)the heart is unable to move blood from the pulmonary circuit to the systemic circuit at the rate needed. This would result in the back up of blood in the pulmonary circuit.The Parasympathetic Nervous System (PNS) releases ______, which binds to ________ receptors on the heart. Group of answer choices Norepinephrine; beta ACh; beta ACh; muscarinic Norepinephrine; muscarinicSelect the correct answer for each question. Explain why you chose that answer as opposed to the others. In other words, explain why the other choices are incorrect. Select the correct statement about cardiac output. A slow heart rate increases end diastolic volume, stroke volume, and force of contraction. Decreased venous return will result in increased end diastolic volume. Stroke volume increases if end diastolic volume decreases. If a semilunar valve were partially obstructed the end systolic volume in the affected ventricle would be decreased.
- The heart beats without extrinsic stimulation from the autonomic nervous system. True or FalseBelow is the homeostatic reflex arc for heart rate and blood pressure. Please note that this homeostatic reflex begins once the activity has stopped to reset resting HR. Please match the following statements (on the left) to the appropriate steps in the pathway (on the right). You will use each match once. 6. 5 Heart rate slows Medulla oblongata 1. Stimulus 3 SA node (pacemaker) of 2. Receptor 2 heart 3. Integrating center Decreased CO2 waste products due to decreased oxygen consumption. 4. Effector 5. Response Baroréceptors that monitor stretch of aorta and how fast the heart is beating. 1Which of the terms in the following pairs is correctly matched? Group of answer choices Heart contraction : systole Stroke volume : end systolic volume minus end diastolic volume End diastolic volume : volume of blood in the ventricle immediately after it has contracted Passive filling : blood moves into the ventricles because the atria contract